Document:

Exhibit 10(ss)

                              SEPARATION AGREEMENT

      THIS AGREEMENT (this "Agreement"), made and entered into as of this 30th
day of March, 2001, by and between SIGA Technologies, Inc., 420 Lexington
Avenue, Suite 620, New York, New York 10170, and Judson A. Cooper, 61 Banksville
Road, Armonk, New York, 10504. As used throughout this Agreement: "Company"
refers to SIGA Technologies, Inc., together with its their past and present
parents, subsidiaries, and affiliates, and each of their respective past and
present officers, directors, agents, employees, successors and assigns, in both
their individual and corporate capacities; and "Executive" refers to Judson A.
Cooper, his heirs, executors, administrators, agents, successors, assigns and
dependents.

                                   WITNESSETH:
                                   ----------

      WHEREAS, Executive is serving as the Chairman and Executive Vice President
of SIGA Technologies, Inc. and as a member of the Board of Directors of SIGA
Technologies, Inc.; and

      WHEREAS, by mutual agreement between Executive and the Company, Executive
has agreed to resign as an employee, officer and director of the Company
effective as of April 16, 2001 or such other date as is consented to by Donald
G. Drapkin (the "Effective Date"); and

      WHEREAS, SIGA Technologies, Inc., Executive, Joshua D. Schein, Ph.D.
Gabriel M. Cerrone, Thomas E. Constance, Donald G. Drapkin and Eric A. Rose,
M.D. are entering into a letter agreement of even date herewith (the
"Restructuring Agreement") in reliance, in part, upon the execution and delivery
of, and performance under, this Agreement.

      WHEREAS, there has been a "Change of Control" as such term is defined in
the Employment Agreement (as defined herein).

      NOW, THEREFORE, for and in consideration of the mutual promises, covenants
and obligations contained herein, the parties hereto agree as follows:

ARTICLE I: RESIGNATION AND TERMINATION OF EMPLOYMENT AGREEMENT

      1.1 Resignation and Termination. Executive hereby resigns as an employee,
officer and director of the Company effective as of the close of business on the
Effective Date. Notwithstanding any provision of the Amended and Restated
Employment Agreement between the SIGA Technologies, Inc. and Executive, dated
October 6, 2000 (the "Employment Agreement"), to the contrary, such resignation
shall not be deemed to be a breach by Executive or the Company of the Employment
Agreement. Except as otherwise expressly provided in this Agreement, Executive
agrees that this Agreement supersedes the Employment Agreement (and any other
existing employment agreements between Executive and the Company). Without
limiting the generality of the foregoing, Executive, in consideration of the
benefits received hereunder and under the Restructuring Agreement, waives
payment of any Change of Control Amount as defined in the Employment Agreement.

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      1.2 Certain Representations. Executive represents and warrants that, other
than the Employment Agreement and as provided for under the Restructuring
Agreement, Executive is not party to any agreement or arrangement respecting
employment by the Company. Executive also represents and warrants that, to the
best of his knowledge, he has fully complied with his obligations under the
Employment Agreement and has done nothing contrary to its terms.

ARTICLE II: SEVERANCE PAYMENTS AND BENEFITS

      Section 2.1 Payments. On the Effective Date, SIGA Technologies, Inc. shall
pay Executive, any accrued, but unpaid Base Salary (as defined in the Employment
Agreement) through the Effective Date in full and complete satisfaction of any
and all amounts due to Executive from the Company upon termination of employment

      Section 2.2 Options. The terms of certain options held by Executive shall
be modified in accordance with, and subject to, the terms and conditions of the
Restructuring Agreement.

      Section 2.3 Company Benefits. SIGA Technologies, Inc. shall provide
Executive with certain health insurance benefits in accordance with, and subject
to, the terms and conditions of the Restructuring Agreement.

      Section 2.4 Withholding of Taxes. The Company will withhold from any
benefits or compensation payable under this Agreement or the Restructuring
Agreement all federal, state and local taxes, social security and all other
customary withholdings as may be required pursuant to any law or governmental
regulation or ruling.

      Section 2.5 No Other Payments. Except as specifically provided in this
Article 2 or in the Restructuring Agreement or as otherwise required by law,
Executive shall not be entitled to receive any sums of money, payments, benefits
or severance amounts from the Company following the Effective Date, whether
pursuant to the Employment Agreement or otherwise.

ARTICLE III: CONFIDENTIAL INFORMATION AND RETURN OF PROPERTY

      Section 3.1 Confidentiality. Executive acknowledges that during his
service and employment with the Company he has been privy and made party to
confidential information, including but not limited to knowledge or data
relating to the Company and the Company's businesses and investments,
information regarding vendors, employees, strategic and business plans, and
analysis of competitors ("Confidential Information") and Trade Secrets (as
defined below).

      (a) It is a material condition of this Agreement that Executive complies
with the terms of Section 9 of the Employment Agreement (entitled
"Confidentiality, Ownership, and Covenants"), the terms of which are
incorporated by reference herein; provided, however, that Executive shall be
relieved of his obligations under Subsection (d) and clauses (i) and (ii) of

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Subsection (e) thereof. Matters concerning notice and severability in connection
with Section 9 of the Employment Agreement shall continue to be governed by
Sections 15 and 16 of the Employment Agreement, each of which is incorporated by
reverence herein.

            (b) In addition to, and not limited by, the provisions of Section 9
of the Employment Agreement, Executive agrees that, following the Effective
Date, Executive shall hold in a fiduciary capacity for the benefit of the
Company all Trade Secrets and Confidential Information, which shall have been
obtained by Executive during his service and employment with the Company and
which is not generally available public knowledge (other than by acts by
Executive). Executive shall not at any time, without the prior written consent
of SIGA Technologies, Inc. or as may otherwise be required by law or any legal
process (in which case Executive shall use his reasonable best efforts in
cooperating with the Company in obtaining a protective order against disclosure
by a court of competent jurisdiction), communicate or divulge any such Trade
Secrets or Confidential Information to anyone other than the Company and those
expressly designated by the Company. For purposes of this Agreement, "Trade
Secrets" shall mean all information, without regard to form, including, but not
limited to, technical or non-technical data, formulae, patterns, compilations,
programs, devices, methods, techniques, drawings, processes, financial data,
financial plans, business projections, product plans, distribution lists or
lists of actual or potential customers, advertisers or suppliers which is not
commonly known by or available to the public and which information: (a) derives
economic value, actual or potential, from not being generally known to, and not
being readily ascertainable by proper means by, other persons who can obtain
economic value from its disclosure or use and (b) is the subject of efforts that
are reasonable under the circumstances to maintain its secrecy.

      Section 3.2 Return of Property. All records, files, drawings, documents,
models, equipment, and the like relating to the Company's business and any and
all property (in what ever form or medium) of the Company in Executive's
possession, custody or control shall be returned to SIGA Technologies, Inc. on
or before the Effective Date. Executive hereby assigns to SIGA Technologies,
Inc. all rights, title and interest in and to Trade Secrets and other products
relating to the Company's business developed by him alone or in conjunction with
others at any time while employed by or in the service of the Company. Executive
shall take all such further actions as are reasonably necessary to effectuate
the provisions of this Section 3.2.

ARTICLE IV: NO ADMISSION.

      In executing this Agreement, neither the Company nor Executive admits any
liability or wrongdoing, and the considerations exchanged herein do not
constitute an admission of any liability, error, contract violation, or
violation of any federal, state, or local law or regulation.

ARTICLE V: RELEASE

      Section 5.1 Release of Claims by Executive.

            (a) Except as necessary to enforce the terms of this Agreement and
the Restructuring Agreement, and in exchange for and in consideration of the
promises, covenants

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and agreements set forth herein and therein, Executive hereby releases the
Company to the maximum extent permitted by law from any and all manner of
claims, demands, causes of action, obligations, damages, or liabilities
whatsoever of every kind and nature, at law or in equity, known or unknown, and
whether or not discoverable, which Executive has or may have for any period
prior to and including the date of his execution of this Agreement, including,
but not limited to, any claim of defamation, wrongful discharge, breach of
contract, claims for unpaid wages, claims arising under or related to the
Employment Agreement and claims of discrimination under the Age Discrimination
in Employment Act of 1967 and all other federal, state and local laws, and any
claim for attorneys' fees or costs.

                  (b) Executive represents that he does not have any claim,
action or proceeding pending against the Company or which arises out of his
employment by the Company. Executive represents and warrants that he has not
assigned or subrogated any of his rights, claims and causes of action, including
any claims referenced in this Agreement, or authorized any other person or
entity to assert such claim or claims on his behalf, and he agrees to indemnify
and hold harmless the Company against any assignment of said rights, claims
and/or causes of action.

      Section 5.2 Release of Claims by the Company. Except as necessary to
enforce the terms of this Agreement and the Restructuring Agreement, and in
exchange for and in consideration of the promises, covenants and agreements set
forth herein, the Company hereby releases Executive from any and all manner of
claims, demands, causes of action, obligations, damages, or liabilities
whatsoever of every kind and nature, at law or in equity, known or unknown, and
whether or not discoverable, arising out of Executive's employment by the
Company which the Company has or may have for any period prior to and including
the date of the execution of this Agreement; provided, however, that the Company
does not release herein any claims the Company may now or in the future have
against Executive for acts of intentional misconduct committed by Executive
during Executive's employment with the Company.

ARTICLE VI: FORM S-8

      The Company shall have obligations with respect to the Registration
Statement on Form S-8 registering Common Stock issued in connection with the
Company's employee stock incentive plan in accordance with, and subject to the
terms and conditions of, the Restructuring Agreement.

ARTICLE VII: INDEMNIFICATION AND DIRECTORS AND OFFICERS INSURANCE

      The Company shall indemnify Executive in accordance with, and subject to
the terms and conditions of the Restructuring Agreement. The Company shall cause
Executive to be covered by its directors and officers liability insurance policy
so long as it maintains such a policy for any current or former directors or
officers; provided that this obligation shall cease upon the expiration of all
applicable statutes of limitations applicable to potential causes of action
against Executive which could be covered under such insurance policy.

ARTICLE VIII: MISCELLANEOUS

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      Section 8.1 Remedy. Should Executive engage in or perform, either directly
or indirectly, any of the acts prohibited by Article 3 or, in any other way,
violate such Article, it is agreed that the Company would suffer irreparable
harm that would be impossible to quantify. Accordingly, the Company shall be
entitled to full injunctive relief, to be issued by any competent court of
equity, enjoining and restraining Executive and each and every other person,
firm, organization, association, or corporation concerned therein, from the
continuance of such violative acts. The foregoing remedy shall not be deemed to
limit or prevent the exercise by the Company of any or all further rights and
remedies which may be available to the Company hereunder or at law or in equity.

      Section 8.2 Notices. For purposes of this Agreement, notices and all other
communications provided for herein shall be in writing and shall be deemed to
have been duly given when personally delivered, sent by facsimile or when mailed
by United States registered or certified mail, return receipt requested, postage
prepaid, addressed to such address as provided in the preamble hereto or sent to
such other address or facsimile number as each party may furnish to the other in
writing from time to time in accordance with this Section 8.2.

      Section 8.3 Applicable Law. This Agreement is entered into under, and
shall be governed for all purposes by, the laws of the State of New York without
giving effect to any choice of law principles or to where the parties are
located at the time a dispute arises.

      Section 8.4 No Waiver. No failure by either party hereto at any time to
give notice of any breach by the other party of, or to require compliance with,
any condition or provision of this Agreement shall (i) be deemed a waiver of
similar or dissimilar provisions or conditions at the same or at any prior or
subsequent time or (ii) preclude insistence upon strict compliance in the
future.

      Section 8.5 Severability. If a court of competent jurisdiction determines
that any provision of this Agreement is invalid or unenforceable, then the
invalidity or unenforceability of that provision shall not affect the validity
or enforceability of any other provision of this Agreement, and all other
provisions shall remain in full force and effect and such invalid or
unenforceable provision shall be reformulated by such court to preserve the
intent of the parties hereto.

      Section 8.6 Counterparts. This Agreement may be executed in one or more
counterparts, each of which shall be deemed to be an original, but all of which
together will constitute one and the same Agreement.

      Section 8.7 Headings. The Article, Section and Subsection headings used
herein have been inserted for purposes of convenience only and shall not be used
for interpretive purposes.

      Section 8.8 Gender and Plurals. Wherever the context so requires, the
masculine gender includes the feminine or neuter, and the singular number
includes the plural and conversely.

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      Section 8.9 Affiliate. As used in this Agreement, "affiliate," with
respect to any person or entity, shall mean any other person or entity which
directly or indirectly through any one or more intermediaries owns or controls,
is owned or controlled by, or is under common ownership or control with such
person or entity.

      Section 8.10 Assignment. No rights or obligations of Executive hereunder
may be assigned by Executive to any other person or entity, except by will or
the laws of descent and distribution. In the event of Executive's death prior to
receipt by Executive of all amounts payable to Executive hereunder, such amounts
shall be payable to Executive's designated beneficiaries on the same schedule as
provided for in this Agreement. No rights or obligations of SIGA Technologies,
Inc. under this Agreement may be assigned or delegated to any other person or
entity, except to a successor to the business or substantially all of the assets
of SIGA Technologies, Inc.

      Section 8.11 Entire Agreement. Except as otherwise expressly provided
herein, this Agreement, together with the Restructuring Agreement, constitutes
the entire agreement of the parties with regard to the subject matter hereof,
contains all the covenants, promises, representations, warranties and agreements
between the parties with respect to Executive's resignation from the Company and
supersedes all prior employment or severance agreements between Executive and
the Company, including, but not limited to, the Employment Agreement (except as
otherwise expressly provided herein). Executive acknowledges and agrees that the
consideration provided for herein is adequate consideration for Executive
waiving his rights under the Employment Agreement. Except as otherwise expressly
provided herein, each party to this Agreement acknowledges that no
representation, inducement, promise or agreement, oral or written, has been made
by either party, or by anyone acting on behalf of either party, which is not
embodied herein or in the Restructuring Agreement, and that no agreement,
statement, or promise relating to Executive's resignation from the Company, that
is not contained in this Agreement or the Restructuring Agreement, shall be
valid or binding. Any modification of this Agreement will be effective only if
it is in writing and signed by the parties and consented to in writing by each
party to the Restructuring Agreement. Each Party to the Restructuring Agreement
that is not also a party hereto shall be a third party beneficiary of this
Agreement.

      Section 8.12 Legal Fees. The Company shall reimburse Executive for certain
legal fees and expenses in accordance with, and subject to, the terms and
conditions of the Restructuring Agreement.

ARTICLE IX: EXECUTIVE ACKNOWLEDGEMENTS

      Section 9.1 Executive acknowledges that he has read and understands the
terms of this Agreement and has voluntarily agreed to these terms without
coercion or undue persuasion by the Company.

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      Section 9.2 Executive acknowledges that he has been advised to consult
with an attorney prior to executing this Agreement. Executive also acknowledges
that he has had an adequate opportunity to review this Agreement before its
execution.

      Section 9.3 Executive acknowledges that he has been afforded an
opportunity to take at least twenty-one (21) days to consider this Agreement and
has been advised to consult with the attorneys of his choice prior to executing
this Agreement. Executive further acknowledges that he will have a period of
seven (7) calendar days following his execution of this Agreement in which to
revoke his consent, and that such revocation will be effective only if received
in writing by Kramer Levin Naftalis & Frankel LLP, 919 Third Avenue, New York,
New York, 10022, Attention: David M. Zlotchew, Esq., on or before the expiration
of this seven (7) day period. This Agreement will not become effective or
enforceable until the revocation period has expired.

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<PAGE>

      IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the date first written above.

                                          SIGA TECHNOLOGIES, INC.

                                          By: /s/ Thomas N. Konatich
                                             -----------------------------------
                                             Thomas N. Konatich
                                             Vice President-Chief Financial
                                             Officer

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<PAGE>

      IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the date first written above.

                                          SIGA TECHNOLOGIES, INC.

                                          By:
                                             -----------------------------------

                                             /s/ Judson A. Cooper
                                             -----------------------------------
                                             Judson A. Cooper

                                       9Exhibit 10(tt)

                                                               EXECUTION VERSION

                              EMPLOYMENT AGREEMENT

            THIS AGREEMENT (the "Agreement"), made in New York, New York, as of
the 22nd day of June, 2001, between Siga Technologies, Inc., a Delaware
corporation having its executive offices and principal place of business at 420
Lexington Avenue, Suite 620, New York, New York 10170 (the "Company"), and
Philip N. Sussman, an individual currently residing at 145 West 86th Street,
Apt. 7A, New York, New York 10024 ("Executive").

            WHEREAS, the Company desires to employ Executive, and Executive
desires to accept such employment on the terms and conditions hereinafter set
forth;

            NOW, THEREFORE, IN CONSIDERATION of the mutual covenants and
agreements hereinafter set forth, the Company and Executive agree as follows:

            1. Term.

                  The term of this Agreement shall be the two-year period
commencing on June 22, 2001 and ending on June 21, 2003, and as may be extended
from time to time pursuant to Section 9(p) hereof, (the "Term").

            2. Employment.

                  (a) Employment by the Company. The Company shall employ
Executive and Executive agrees to be employed by the Company during the Term
upon the terms and subject to the conditions set forth in this Agreement.
Executive shall serve as President and Chief Executive Officer of the Company
and shall have such duties as may be prescribed by the Company consistent with
the duties generally prescribed to executives of the same level and
responsibility as implied by the titles given to Executive and also shall serve
in such additional position(s) as the Company may reasonably determine from time
to time, provided that the responsibilities of such additional position(s) do
not materially impair Executive's ability to perform as President and Chief
Executive Officer.

                  (b) Performance of Duties. Throughout the Term, Executive
shall faithfully and diligently perform Executive's duties in conformity with
the directions of the Company and serve the Company to the best of Executive's
ability. Executive shall devote Executive's entire working time to the business
and affairs of the Company, subject to vacations and sick leave in accordance
with Company policy and as otherwise permitted herein. Notwithstanding anything
to the contrary in this Section 2(b), so long as such activities do not preclude
or render unlawful Executive's employment by the Company or otherwise materially
inhibit the performance of his duties under this Agreement or materially impair
the business of the Company, Executive (i) may make personal investments which
are not in conflict with his duties to the Company and manage personal and
family financial and legal affairs, (ii) may continue to serve on any board of
directors on which he is known by the Board of Directors of the Company to be
serving on the effective date of this Agreement, as specified in Schedule A
hereto, (iii) may serve as a director of (or hold a similar position with) any
corporation, trade

<PAGE>

association, or charitable organization with the approval of the Board of
Directors of the Company.

                  (c) Place of Performance. Executive shall be based at the
Company's principal place of business in New York, New York, or in such other
location(s) in New York City, Nassau County, or Westchester County, or in New
Jersey at a distance that is no longer than 30 miles from the Empire State
Building as the Company may determine.

            3. Compensation and Benefits.

                  (a) Base Salary. The Company agrees to pay to Executive a base
salary ("Base Salary") at the annual rate of $300,000, payable in equal
installments consistent with the Company's payroll practices.

                  (b) Benefits and Perquisites. Executive shall be entitled to
participate in, to the extent Executive is otherwise eligible under the terms
thereof, the benefit plans and programs, and receive the benefits and
perquisites, generally provided to executives of the same level and
responsibility as Executive, including without limitation family medical
insurance, life insurance and disability insurance (subject to applicable
employee contributions). Executive's annual vacation entitlement shall be the
greater of four weeks and the amount of vacation to which Executive is entitled
under Company policy; provided, however, that Executive's vacation entitlement
shall be the same as or greater than the vacation entitlement of each other
employee of the Company.

                  (c) Bonus. The Company may, in its sole discretion, pay to
Executive an annual bonus based on the performance of the Company and of
Executive as determined by the Company in its sole discretion.

                  (d) Grant of Options and Terms Thereof. On or before June 30,
2001, the Company shall grant to Executive a non-qualified option (the
"Option"), to purchase four hundred twenty thousand (420,000) shares of the
Company's common stock at a share price equal to the closing share price of the
Company's common stock on the date of the execution of this Agreement. The
Option shall vest in four equal installments -- on the first, second, third, and
fourth anniversaries of Executive's employment under this Agreement -- provided
that Executive is employed by the Company or receiving severance pay under
Section 4(d) or 4(e) of this Agreement on the respective vesting dates. All
terms of the Option shall be governed by the Company's Amended and Restated 1996
Incentive and Non-Qualified Stock Option Plan (the "Plan"), as well as the
applicable option agreement to be entered into pursuant to the terms of the
Plan; provided, however, that this Agreement supersedes the Plan with respect to
the terms of the Option contained herein and provided further that the term
"Cause" in the Plan shall be defined as the term "Cause" is defined in Section
4(b) of this Agreement. Notwithstanding the foregoing all options granted
hereunder shall be contingent upon stockholder approval of the Plan.

                  (e) Travel and Business Expenses. Upon submission of itemized
expense statements in the manner specified by the Company, Executive shall be
entitled to reimbursement for reasonable travel and other reasonable business
expenses duly incurred by Executive in the performance of Executive's duties
under this Agreement in accordance with the

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policies and procedures established by the Company from time to time for
executives of the same level and responsibility as Executive.

                  (f) No Other Compensation or Benefits; Payment. The
compensation and benefits specified in this Section 3 and in Section 4 of this
Agreement shall be in lieu of any and all other compensation and benefits.
Payment of all compensation and benefits to Executive hereunder shall be made in
accordance with the relevant Company policies in effect from time to time to the
extent the same are consistently applied, including normal payroll practices,
and shall be subject to all applicable employment and withholding taxes and
other withholdings.

                  (g) Cessation of Employment. In the event Executive shall
cease to be employed by the Company for any reason, then Executive's
compensation and benefits shall cease on the date of such event, except as
otherwise provided herein or in any applicable employee benefit plan or program.

            4. Termination of Employment.

                  (a) Termination. The Company may terminate Executive's
employment for Cause (as defined below) or for any material breach of this
Agreement, in which case the provisions of Section 4(b) of this Agreement shall
apply. The Company may also terminate Executive's employment in the event of
Executive's Disability (as defined below), in which case the provisions of
Section 4(c) of this Agreement shall apply. The Company may also terminate the
Executive's employment for any other reason by written notice to Executive, in
which case the provisions of Section 4(d) of this Agreement shall apply. If
Executive's employment is terminated by reason of Executive's death, retirement
or voluntary resignation, the provisions of Section 4(b) of this Agreement shall
apply.

                  (b) Termination for Cause; Termination by Reason of Death or
Retirement or Voluntary Resignation. In the event that Executive's employment
hereunder is terminated during the Term (x) by the Company for Cause (as defined
below), (y) by reason of Executive's death or retirement or (z) by reason of
Executive's voluntary resignation, then the Company shall pay to Executive only
the Base Salary through such date of termination. For purposes of this
Agreement, "Cause" shall mean (i) conviction of any crime (whether or not
involving the Company) constituting a felony in the jurisdiction involved; (ii)
engaging in any act which, in each case, subjects, or if generally known would
subject, the Company to public ridicule or embarrassment; (iii) gross neglect or
gross misconduct in the performance of Executive's duties hereunder; (iv)
willful failure or refusal to perform such duties as may reasonably be delegated
to Executive; or (v) material breach of any provision of this Agreement by
Executive; provided, however, that a termination pursuant to clause (iii), (iv),
or (v) shall not become effective unless the Executive fails to cure such
neglect, misconduct, failure or refusal to perform, or breach within twenty (20)
days after written notice from the Company, such notice to describe such
neglect, misconduct, failure or refusal to perform, or breach.

                  (c) Disability. If, as a result of Executive's incapacity due
to physical or mental illness, Executive shall have been absent from Executive's
duties hereunder on a full time basis for either (i) one hundred twenty (120)
days within any three hundred sixty-five (365) day period, or (ii) ninety (90)
consecutive days, the Company may terminate Executive's

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employment hereunder for "Disability". In that event, the Company shall pay to
Executive only the Base Salary through such date of termination. During any
period that Executive fails to perform Executive's duties hereunder as a result
of incapacity due to physical or mental illness (a "Disability Period"),
Executive shall continue to receive the compensation and benefits provided by
Section 3 of this Agreement until Executive's employment hereunder is
terminated; provided, however, that the amount of compensation and benefits
received by Executive during the Disability Period shall be reduced by the
aggregate amounts, if any, payable to Executive under disability benefit plans
and programs of the Company or under the Social Security disability insurance
program.

                  (d) Termination By Company For Any Other Reason. In the event
that Executive's employment hereunder is terminated by the Company during the
Term for any reason other than as provided in Section 4(b) or 4(c) of this
Agreement, then the Company shall pay to Executive the Base Salary through such
date of termination, and, in lieu of any further compensation and benefits for
the balance of the Term: (x) the Company shall provide Executive with severance
pay equal to six months of Base Salary, which severance pay shall be paid
commencing with such date of termination at the times and in the amounts such
Base Salary amounts would have been paid if Executive had remained employed by
the Company for the six-month period immediately following the date of
termination; and (y) if Executive timely elects COBRA continuation medical
coverage, the Company shall reimburse Executive for COBRA premium costs for the
level of coverage Executive maintained on the date of termination incurred by
Executive for the six months immediately following the termination of his
employment; provided, however, that the Company's obligation to make such COBRA
reimbursement payments shall cease upon Executive becoming eligible for medical
coverage under another group health plan. During the period in which Executive
receives severance pay under this Section 4(d), the Option shall continue to
vest and the Company shall provide Executive with an office and office services
through an executive outplacement service. If Executive's employment is
terminated under this Section 4(d), Executive's vested options shall be
exercisable for three years immediately following the end of the six-month
period during which he received severance pay. Notwithstanding anything to the
contrary contained herein, in the event that Executive shall materially breach
Section 5, 6, or 7 of this Agreement, in addition to any other remedies the
Company may have in the event Executive breaches this Agreement, the Company's
obligation pursuant to this Section 4(d) to make severance payments shall cease,
the Option shall expire, and Executive's rights with respect to severance pay
and the Option shall terminate and shall be forfeited. The entitlement to
severance pay and option vesting and exercisability hereunder shall not be
affected by, or reduced by virtue of, any subsequent employment, or income, that
Executive may obtain.

                  (e) Termination by Executive upon Change in Control. Upon a
Change in Control, if Executive is no longer the President and Chief Executive
Officer or its equivalent of the surviving organization, then Executive may
terminate his employment with Company within 90 days of the Change in Control.
If Executive terminates his employment under this Section 4(e), the Company
shall pay to Executive the Base Salary through such date of termination and, in
lieu of any further compensation and benefits for the balance of the Term,
severance pay equal to six months of Base Salary, which severance pay shall be
paid commencing with such date of termination at the times and in the amounts
such Base Salary amounts would have been paid if Executive had remained employed
by the Company for the six-

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month period immediately following the date of termination and all unvested
options shall be, and become, vested on the date of termination. For purposes of
this Agreement, Change in Control shall mean any of the following occurrences:

                        (i) the Corporation sells all or substantially all of
its assets to one "person" (as such term is used in Sections 13(d) and 14(d)(2)
of the Securities Exchange Act of 1934, as amended (the "Exchange Act")) who is
unaffiliated with the Corporation (or a related group) (as defined in the
Exchange Act); or

                        (ii) the stockholders of the Corporation approve a
merger or consolidation of the Corporation with any other corporation, other
than a merger or consolidation which would result in the voting securities of
the Corporation outstanding immediately prior thereto continuing to represent
(either by remaining outstanding or by being converted into voting securities of
the surviving entity) more than 50% of the combined voting power of the voting
securities of the Corporation or such surviving entity outstanding immediately
after such merger or consolidation; provided, however, that a merger or
consolidation effected to implement a recapitalization of the Corporation (or
similar transaction) in which no "person" (as defined above) acquires more than
50% of the combined voting power of the Corporation's then outstanding
securities shall not constitute a Change in Control.

                  (f) Release. The Company shall have the right to condition the
payment of any severance, continued vesting of options, and/or provision of
benefits pursuant to this Section 4 upon the delivery by Executive to the
Company of a release in form and substance satisfactory to the Company of any
and all claims Executive may have against the Company and its directors,
officers, employees, subsidiaries, affiliates, stockholders (in their capacity
as stockholders), successors, assigns, agents and representatives arising out of
or related to Executive's employment by the Company and the termination of such
employment.

            5. Exclusive Employment; Noncompetition.

                  (a) No Conflict; No Other Employment. During the period of
Executive's employment with the Company, Executive shall not: (i) engage in any
activity which conflicts or interferes with or derogates from the performance of
Executive's duties hereunder nor shall Executive engage in any other business
activity, whether or not such business activity is pursued for gain or profit,
except as approved in advance in writing by the Board of Directors of the
Company; provided, however, that Executive shall be entitled to manage his
personal investments and otherwise attend to personal affairs, including
charitable activities, in a manner that does not unreasonably interfere with his
responsibilities hereunder, or (ii) accept any other full-time or substantially
full-time employment, whether as an executive or consultant or in any other
capacity, and whether or not compensated therefor. The Company acknowledges that
Executive may have obligations to his former employer as described in Appendix B
and states that as of the date of execution of this Agreement it does not
believe those obligations to be in breach of this Section 5(a).

                  (b) No Competition. Executive recognizes the highly
competitive nature of the Company's business and that Executive's position with
the Company and access to and use of the Company's confidential records and
proprietary information renders Executive

                                      - 5 -
<PAGE>

special and unique. Without limiting the generality of the provisions of Section
2(b) or 5(a) of this Agreement, during the Term, and any extension thereof, and
for a period of one year after the termination of Executive's employment with
the Company for any reason, Executive shall not, directly or indirectly, own,
manage, operate, join, control, participate in, invest in or otherwise be
connected or associated with, in any manner, including as an officer, director,
employee, independent contractor, stockholder, member, partner, consultant,
advisor, agent, proprietor, trustee or investor, any Competing Business located
in the United States; provided, however, that ownership of 2% or less of the
stock or other securities of a corporation, the stock of which is listed on a
national securities exchange or is quoted on The Nasdaq Stock Market, shall not
constitute a breach of this Section 5, so long as Executive does not in fact
have the power to control, or direct the management of, or is not otherwise
associated with, such corporation.

            For purposes hereof, the term "Competing Business" shall mean any
business or venture which, directly or indirectly, relates to the development
and commercialization of antimicrobial drugs and vaccines, both of which are
directed at bacterial infections or to any other areas of concentration of the
Company during Executive's employment; provided, however, that Executive's
affiliation with a Competing Business shall not be in breach of this Section
5(b) as long as his affiliation does not in any way relate to the development
and commercialization of anti-microbial drugs and vaccines directed at bacterial
infections or to any other areas of concentration of the Company during
Executive's employment.

                  (c) No Solicitation of Employment. During the Term, and any
extension thereof, and for a period of one year thereafter, Executive shall not
solicit or encourage any other employee to leave the Company for any reason, nor
assist any business in doing so, nor employ such an employee in a Competing
Business or any other business.

                  (d) Company Customers. Executive shall not, during the Term,
and any extension thereof, and for a period of one year thereafter, except as
required by the Company in the performance by Executive of his duties under this
Agreement, directly or indirectly, on behalf of a Competing Business, contact,
solicit or do business with any "customers" (as defined below) of the Company
for the purpose of selling or licensing anti-microbial drugs or vaccines
directed at bacterial infections or any other product then sold or licensed by
the Company or proposed to be sold or licensed by the Company. For the purposes
of the provisions of this Section 5(d), "customer" shall include any entity
that, within two years prior to the termination of Executive's employment
hereunder, purchased or licensed any product from the Company. The term
"customer" also includes any former customer or potential customer of the
Company which the Company has solicited within two years prior to the
termination of Executive's employment hereunder for the purpose of selling or
licensing any product then sold or licensed by the Company or proposed to be
sold or licensed.

                  (e) Executive understands that the provisions of this Section
5 may limit his ability to earn a livelihood in a business that competes with
the business of the Company but nevertheless agrees and hereby acknowledges that
the consideration provided under this Agreement is sufficient to justify the
restrictions contained in such provisions. In consideration thereof and in light
of Executive's education, skills and abilities, Executive agrees

                                      - 6 -
<PAGE>

that he will not assert in any forum that such provisions prevent him from
earning a living or otherwise are void or unenforceable or should be held void
or unenforceable.

6. Inventions and Proprietary Property.

                  (a) Definition of Proprietary Property. For purposes of this
Agreement, "Proprietary Property" shall mean designs, specifications, ideas,
formulae, discoveries, inventions, improvements, innovations, concepts and other
developments, trade secrets, techniques, methods, know-how, technical and
non-technical data, works of authorship, computer programs, computer algorithms,
computer architecture, mathematical models, drawings, trademarks, copyrights,
customer lists, marketing plans, and all other matters which are legally
protectible or recognized as forms of property, whether or not patentable or
reduced to practice or to a writing. Notwithstanding anything to the contrary
elsewhere contained in this Section 6, it is expressly understood that the
Proprietary Rights to articles prepared or written for the trade press may be
assigned to the respective trade press companies.

                  (b) Assignment of Proprietary Property to the Company.
Executive hereby agrees to assign, transfer and set over, and Executive does
hereby assign, transfer and set over, to the Company, without further
compensation, all of Executive's rights, title and interest in and to any and
all Proprietary Property which Executive, either solely or jointly with others,
has conceived, made or suggested or may hereafter conceive, make or suggest, in
the course of Executive's employment with the Company.

            The assignment of Proprietary Property hereunder includes without
limitation all rights of paternity, integrity, disclosure and withdrawal and any
other rights that may be known as or referred to as moral rights and the like
("Moral Rights"). To the extent that such Moral Rights cannot be assigned under
applicable law and to the extent the following is allowed by the laws in the
various countries where Moral Rights exist, Executive hereby waives such Moral
Rights and consents to any action of the Company or any third party that would
violate such Moral Rights in the absence of such consent. Executive also will
endeavor to facilitate such use of any such Moral Rights as the Company shall
reasonably instruct, including confirming any such waivers and consents from
time to time as requested by the Company.

                  (c) Works for Hire. Executive acknowledges that all original
works of authorship or other creative works which are made by Executive (solely
or jointly with others) within the scope of the employment of Executive by the
Company and which are protectable by copyright are "works made for hire,"
pursuant to United States Copyright Act (17 U.S.C., Section 101). To the extent
such original work of authorship or other creative works are not works made for
hire, Executive hereby assigns to the Company all of the rights comprised in the
copyright of such works.

                  (d) Disclosure of Proprietary Property and Execution of
Documents. Executive further agrees to promptly disclose to the Company any and
all Proprietary Property which Executive has assigned, transferred and set over
or will assign, transfer and set over as provided in paragraph (b) and Executive
agrees to execute, acknowledge and deliver to the Company, without additional
compensation and without expense to Executive, any and all instruments
reasonably requested, and to do any and all lawful acts which, in the reasonable

                                       - 7 -
<PAGE>

judgment of the Company or its attorneys may be required or desirable in order
to vest in the Company all property rights with respect to such Proprietary
Property.

                  (e) Enforcement of Proprietary Rights. Executive will assist
the Company in every proper way to obtain, assign to the Company, confirm and
from time to time enforce, United States and foreign patent trade secret,
trademark, copyright, mask work, and other intellectual property rights relating
to Proprietary Property in any and all countries. To that end Executive will
execute, verify and deliver such documents and perform such other acts
(including appearances as a witness) as the Company may reasonably request for
use in applying for, obtaining, perfecting, evidencing, sustaining and enforcing
such proprietary rights and the assignment of such Proprietary Property. In
addition, Executive will execute, verify and deliver assignments of such
Proprietary Property and all rights therein to the Company or its designee. The
obligation of Executive to assist the Company with respect to proprietary rights
relating to such Company Proprietary Property in any and all countries shall
continue beyond the termination of employment, but the Company shall compensate
Executive at a reasonable rate after such termination for the time actually
spent at the Company's request on such assistance.

            In the event the Company is unable for any reason, after reasonable
effort, to secure the signature of Executive on any document needed in
connection with the actions specified in the preceding paragraph, Executive
hereby irrevocably designates and appoints the Company and its duly authorized
officers and agents as agent and attorney in fact, which appointment is coupled
with an interest, to act for and on behalf of Executive to execute, verify and
file any such documents and to do all other lawfully permitted acts to further
the purposes of the preceding paragraph with the same legal force and effect as
if executed by Executive. Executive hereby waives and quitclaims to the Company
any and all claims, of any nature whatsoever, which Executive now or may
hereafter have for infringement of any proprietary rights assigned hereunder to
the Company.

                  (f) Third Party Information. To the extent Executive has or
possesses any Confidential Information (as hereinafter defined) belonging to
Executive or to others, Executive will not use or disclose to the Company or
induce the Company to use any such Confidential Information unless the Company
has a legal right to use such Confidential Information. Executive will promptly
advise the Company in writing if any of Executive's involvement with the Company
might result in the possible violation of Executive's undertakings to others or
the use of any Confidential Information of Executive or of others.

            7. Confidential Information.

                  (a) Existence of Confidential Information. The Company owns
and has developed and compiled, and will develop and compile, certain
proprietary techniques and confidential information which have great value to
its business (referred to in this Agreement, collectively, as "Confidential
Information"). Confidential Information includes not only information disclosed
by the Company to Executive, but also information developed or learned by
Executive during the course or as a result of employment with the Company, which
information shall be the property of the Company. Confidential Information
includes all information that has or could have commercial value or other
utility in the business in which the Company is engaged or contemplates
engaging, and all information of which the unauthorized

                                      - 8 -
<PAGE>

disclosure could be detrimental to the interests of the Company, whether or not
such information is specifically labeled as Confidential Information by the
Company. By way of example and without limitation, Confidential Information
includes any and all information developed, obtained, licensed by or to or owned
by the Company concerning trade secrets, techniques, know-how (including
designs, plans, procedures, merchandising, marketing, distribution and
warehousing know-how, processes, and research records), software, computer
programs and designs, development tools, all Proprietary Property, and any other
intellectual property created, used or sold (through a license or otherwise) by
the Company, electronic data information know-how and processes, innovations,
discoveries, improvements, research, development, test results, reports,
specifications, data, formats, marketing data and plans, business plans,
strategies, forecasts, unpublished financial information, orders, agreements and
other forms of documents, price and cost information, merchandising
opportunities, expansion plans, budgets, projections, customer, supplier,
licensee, licensor and subcontractor identities, characteristics, agreements and
operating procedures, and salary, staffing and employment information. The term
"proprietary information" shall not include information generally known or
available to the public or generally known or available to the industry or
information that becomes available to Executive on a non-confidential basis
from a source other than the Company or its directors, officers, employees, or
agents (without breach of any obligation of confidentiality).

                  (b) Protection of Confidential Information. Executive
acknowledges and agrees that in the performance of Executive's duties hereunder
the Company may disclose to and entrust Executive with Confidential Information
which is the exclusive property of the Company and which Executive may possess
or use only in the performance of Executive's duties to the Company. Executive
also acknowledges that Executive is aware that the unauthorized disclosure of
Confidential Information, among other things, may be prejudicial to the
Company's interests, an invasion of privacy and an improper disclosure of trade
secrets. Executive shall not, directly or indirectly, use, make available, sell,
disclose or otherwise communicate to any corporation, partnership or other
entity, individual or other third party, other than in the course of Executive's
assigned duties and for the benefit of the Company, any Confidential
Information, either during the Term or thereafter.

                  (c) Delivery of Records. Etc. In the event Executive's
employment with the Company ceases for any reason, Executive will not remove
from the Company's premises without its prior written consent any records
(written or electronic), files, drawings, documents, equipment, materials and
writings received from, created for or belonging to the Company, including those
which relate to or contain Confidential Information, or any copies thereof. Upon
request or when employment with the Company terminates, Executive will
immediately deliver the same to the Company; provided, however, that Executive
shall be allowed to retain a copy of any business and personal contact
information that Executive brought to the Company, including any updating to
same that has been done during his employment at the Company.

            8. Assignment and Transfer.

                  (a) Company. This Agreement shall inure to the benefit of and
be enforceable by, and may be assigned by the Company to, any purchaser of all
or substantially all

                                      - 9 -
<PAGE>

of the Company's business or assets, any successor to the Company or any
assignee thereof (whether direct or indirect, by purchase, merger, consolidation
or otherwise).

                  (b) Executive. Executive's rights and obligations under this
Agreement shall not be transferable by Executive by assignment or otherwise, and
any purported assignment, transfer or delegation thereof shall be void;
provided, however, that if Executive shall die, all amounts then payable to, or
vested in, Executive hereunder shall be paid in accordance with the terms of
this Agreement to Executive's devisee, legatee or other designee or, if there be
no such designee, to Executive's estate.

            9. Miscellaneous.

                  (a) Other Obligations. Executive represents and warrants that
neither Executive's employment with the Company nor Executive's performance of
Executive's obligations hereunder will conflict with or violate or otherwise are
inconsistent with any other obligations, legal or otherwise, which Executive may
have. Executive covenants that he shall perform his duties hereunder in a
professional manner and not in conflict or violation, or otherwise inconsistent
with other obligations legal or otherwise, which Executive may have.

                  (b) Nondisclosure; Other Employers. Executive will not
disclose to the Company, or use, or induce the Company to use, any proprietary
information, trade secrets or confidential business information of others.

                  (c) Cooperation. Following termination of employment with the
Company for any reason, Executive shall cooperate with the Company, as
reasonably requested by the Company, to affect a transition of Executive's
responsibilities and to ensure that the Company is aware of all matters being
handled by Executive.

                  (d) No Mitigation of Severance. Executive shall be under no
duty to mitigate any losses or damage to, or payments by, the Company, and there
shall be no setoffs or reductions with respect to any severance or other amounts
payable pursuant to Section 4 of this Agreement except as provided in Section 4.

                  (e) Protection of Reputation. During the Term, Executive
agrees that he will not take action which is intended, or would reasonably be
expected, to harm the Company or its reputation or which would reasonably be
expected lead to unwanted or unfavorable publicity to the Company.

                  (f) Governing Law. This Agreement shall be governed by and
construed in accordance with the internal laws of the State of New York, without
regard to principles of the conflict of laws thereof.

                  (g) Jurisdiction; Forum. Each party hereto consents and
submits to the jurisdiction of any state court sitting in New York County, New
York, and the U.S. District Court for the Southern District of New York in
connection with any dispute arising out of or relating to this Agreement. Each
party hereto waives any objection to the laying of venue in such courts and any
claim that any such action has been brought in an inconvenient forum. To the
extent permitted by law, any judgment in respect of a dispute arising out of or
relating to this

                                     - 10 -
<PAGE>

Agreement may be enforced in any other jurisdiction within or outside the United
States by suit on the judgment, a certified copy of such judgment being
conclusive evidence of the fact and amount of such judgment.

                  (h) Waiver of Jury Trial. Each of the parties hereto
irrevocably waives any and all right to trial by jury with respect to any
action, claim or other proceeding arising out of or relating to this Agreement.

                  (i) Entire Agreement. This Agreement (including all exhibits
and schedules hereto) contains the entire agreement and understanding between
the parties hereto in respect of Executive's employment and supersedes, cancels
and annuls any prior or contemporaneous written or oral agreements,
understandings, commitments and practices between them respecting Executive's
employment, including all prior employment agreements, if any, between the
Company and Executive, which agreement(s) hereby are terminated and shall be of
no further force or effect.

                  (j) Amendment. This Agreement may be amended only by a writing
which makes express reference to this Agreement as the subject of such amendment
and which is signed by Executive and, on behalf of the Company, by its duly
authorized officer.

                  (k) Severability. If any term, provision, covenant or
condition of this Agreement or part thereof, or the application thereof to any
person, place or circumstance, shall be held to be invalid, unenforceable or
void by a court of competent jurisdiction, the remainder of this Agreement and
such term, provision, covenant or condition shall remain in full force and
effect, and any such invalid, unenforceable or void term, provision, covenant or
condition shall be deemed, without further action on the part of the parties
hereto, modified, amended and limited, and the court shall have the power to
modify, to the extent necessary to render the same and the remainder of this
Agreement valid, enforceable and lawful. In this regard, Executive acknowledges
that the provisions of Sections 5, 6, and 7 of this Agreement are reasonable and
necessary for the protection of the Company.

                  (1) Construction. The headings and captions of this Agreement
are provided for convenience only and are intended to have no effect in
construing or interpreting this Agreement. The language in all parts of this
Agreement shall be in all cases construed according to its fair meaning and not
strictly for or against the Company or Executive. The use herein of the word
"including," when following any general provision, sentence, clause, statement,
term or matter, shall be deemed to mean "including, without limitation." As used
herein, "Company" shall mean the Company and its subsidiaries and any purchaser
of, successor to or assignee (whether direct or indirect, by purchase, merger,
consolidation or otherwise) of all or substantially all of the Company's
business or assets which is obligated to perform this Agreement by operation of
law, agreement pursuant to Section 8 of this Agreement or otherwise. As used
herein, the words "day" or "days" shall mean a calendar day or days.

                  (m) Nonwaiver. Neither any course of dealing nor any failure
or neglect of either party hereto in any instance to exercise any right, power
or privilege hereunder or under law shall constitute a waiver of any other
right, power or privilege or of the same right, power or privilege in any other
instance. All waivers by either party hereto must be contained in

                                     - 11 -
<PAGE>

a written instrument signed by the party to be charged and, in the case of the
Company, by its duly authorized officer.

                  (n) Remedies for Breach. The parties hereto agree that
Executive is obligated under this Agreement to render personal services during
the Term of a special, unique, unusual, extraordinary and intellectual
character, thereby giving this Agreement special value, and, in the event of a
breach or threatened breach of any covenant of Executive herein, the injury or
imminent injury to the value and the goodwill of the Company's business could
not be reasonably or adequately compensated in damages in an action at law.
Accordingly, Executive expressly acknowledges that the Company shall be entitled
to specific performance, injunctive relief or any other equitable remedy against
Executive, without the posting of a bond, in the event of any breach or
threatened breach of any material provision of this Agreement by Executive
(including, without limitation, Sections 5, 6, and 7). Without limiting the
generality of the foregoing, if Executive breaches or threatens to breach
Section 5, 6, or 7 of this Agreement, such breach or threatened breach will
entitle the Company, without posting of bond, to an injunction prohibiting (i)
Executive from disclosing any Confidential Information to any Competing
Business; (ii) such Competing Business from receiving from Executive or using
any such Confidential Information; and (iii) Executive from, indirectly or
directly, owning, managing, operating, joining, controlling, participating in,
investing in or otherwise being connected or associated with, in any manner, any
such Competing Business. The rights and remedies of the parties hereto are
cumulative and shall not be exclusive, and each such party shall be entitled to
pursue all legal and equitable rights and remedies and to secure performance of
the obligations and duties of the other under this Agreement, and the
enforcement of one or more of such rights and remedies by a party shall in no
way preclude such party from pursuing, at the same time or subsequently, any and
all other rights and remedies available to it.

                  (o) Notices. Any notice, consent, request or other
communication made or given under this Agreement or pursuant to law shall be
sufficient if in writing and shall be deemed to have been duly given when
actually received, or, if mailed, five days after mailing by registered or
certified mail, return receipt requested, to Executive's residence (as reflected
in the Company's records or as otherwise designated by Executive on at least
thirty (30) days' prior written notice to the Company) or to the Company's
principal executive office, attention: Chairman of the Board, as the case may
be. Rejection or other refusal to accept, or the inability to deliver because of
changed address of which no notice was given as provided herein, shall be deemed
to be receipt of the notice, request, consent or approval sent.

                  (p) Extension of the Term. This Agreement may be extended, in
the Company's sole discretion, for a period of one year at the end of the Term
(or any extension thereof) provided that the Company notifies Executive in
writing of its intention to renew this Agreement not later than six months prior
to the end of the Term (or extension thereof) (the "Notice Date"). Any such
extension shall be effective and binding as of the applicable Notice Date. If
the Company fails to offer to extend the Term of this Agreement for at least one
year then the failure to extend shall be treated as a Section 4(d) event as of
the end of the Term.

                  (q) Assistance in Proceedings, Etc. Executive shall during and
after expiration of the Term, upon reasonable notice, furnish such information
and assistance to the Company as may reasonably be required by the Company in
connection with any legal or quasi-

                                     - 12 -
<PAGE>

legal proceeding, including any external or internal investigation, involving
the Company or any of its affiliates or in which any of them is, or may become,
a party. In connection with any cooperation or assistance to be provided by
Executive to the Company following his termination under this Section 9(q), it
is specifically agreed that: (i) Executive shall have all of his reasonable
costs reimbursed to him by the Company; (ii) the Company shall compensate
Executive at a rate of $1,000 per day for his attendance, at the Company's
request, at meetings, conferences, hearings, or other proceedings; and (iii) the
Company acknowledges that Executive desires not to travel outside the New York
metropolitan area to fulfill his obligations under this Section 9(q) and will
consider such desire in making any request for assistance under this Section
9(q).

                  (r) Survival. Cessation or termination of Executive's
employment with the Company shall not result in termination of this Agreement.
The respective obligations of Executive and rights and benefits afforded to the
Company as provided in this Agreement shall survive cessation or termination of
Executive's employment hereunder.

                  (s) Counterparts; fax. For the convenience of the parties
hereto, any number of counterparts hereof may be executed, each such executed
counterpart shall be deemed an original and all such counterparts together shall
constitute one and the same instrument. Facsimile transmission of any signed
original counterpart and/or retransmission of any signed facsimile transmission
shall be deemed the same as the delivery of the original.

                [REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]

                                     - 13 -
<PAGE>

            IN WITNESS WHEREOF, the Company has caused this Agreement to be duly
executed on its behalf by an officer thereunto duly authorized and Executive has
duly executed this Agreement, all as of the date and year first written above.

SIGA TECHNOLOGIES, INC.                 EXECUTIVE:

By:_____________________                ________________________
   Name:                                Philip N. Sussman
   Title:

                                     - 14 -
<PAGE>

                                                               EXECUTION VERSION

                                   Schedule A

            As of the effective date of the Agreement, Executive is a member of
the following boards and panel:

      1.    Editorial Advisory Board of the Journal of Commercial Biotechnology

      2.    Review Panel for the Innovative Technology Grant Program, sponsored
            by the New York State Research Foundation, Center for Biotechnology

      3.    Advisory board of "Investing in Biotechnology" a conference,
            sponsored by International Business Forums to be held in November
            2001

      4.    Advisory board for the New York Biotechnology Association

      5.    Advisory board for the Biotechnology Industry Organization

      6.    Board of Directors of the David Kantrowitz Family Benevolent
            Association

            In addition to serving on the above boards and panel, Executive is
organizing a panel for the Annual Meeting of the Association of University
Technology Managers, to be held in February 2002.

<PAGE>

            IN WiTNESS WHEREOF, the Company has caused this Agreement to be duly
executed on its behalf by an officer thereunto duly authorized and Executive has
duly executed this Agreement, all as of the date and year first written above.

SIGA TECHNOLOGIES, INC.                 EXECUTIVE:

By: /s/ Eric Rose, M.D.
    ----------------------------        -------------------------
    Name: Eric Rose, M.D.               Philip N. Sussman
    Title: Interim CEO

                                     - 14 -
<PAGE>

            IN WITNESS WHEREOF, the Company has caused this Agreement to be duly
executed on its behalf by an officer thereunto duly authorized and Executive has
duly executed this Agreement, all as of the date and year first written above.

SIGA TECHNOLOGIES, INC.                 EXECUTIVE:

By:                                     /s/ Philip N. Sussman
    ----------------------------        -------------------------
    Name:                               Philip N. Sussman
    Title:

                                     - 14 -

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