Document:

EXHIBIT 10.2

                        HARBOUR PETROLEUM COMPANY LIMITED
                                    Suite 406
                             505 - 8th Avenue, S.W.
                                Calgary, Alberta
                                     T2P 1G2
                            Telephone: (403)265-5522

                          OVERRIDING ROYALTY AGREEMENT

THIS AGREEMENT made as of the 4th day of August, A.D. 1981

BETWEEN:

                  HARBOUR PETROLEUM COMPANY LIMITED,
                  a body corporate, having an office in the City of Calgary,
                  in the Province of Alberta,

                  (hereinafter referred to as "Harbour")

                                                           OF THE FIRST PART
                                     - and -

                  N.D.G. SMITH, a geologist, having an office in the
                  City of Calgary, in the Province of Alberta,

                  (hereinafter referred to as "the Geologist")

                                                            OF THE SECOND PART

WHEREAS the Geologist has developed  hydrocarbon  prospects  underlying  certain
lands  in the  Province  of  Alberta,  which  prospects  and land are set out in
Schedule "A" attached hereto (hereinafter referred to as "the said lands"), and;

WHEREAS  Harbour  has  agreed to grant to the  Geologist  a  certain  percentage
overriding royalty on the said lands set out in Schedule "A".

NOW THEREFORE THIS AGREEMENT  WITNESSETH that in  consideration  of the premises
and of the covenants and agreements of the parties  hereinafter  set forth,  the
parties do hereby covenant and agree as follows:

1.                In this Agreement, unless the context otherwise requires:

(a)      "the prospects" means the prospects described in Schedule "A" hereto;

(b)      "the said lands" means the lands described in Schedule "A" hereto where
         and if Harbour acquires an interest therein within 6 months of the date
         of this agreement.

(c)      "petroleum  substances"  means  petroleum,  natural  gas and all  other
         substances  which may be produced  from the said  lands,  the rights to
         which are granted by the documents of title for the said lands.

(d)      "market value" means the current  market value of petroleum  substances
         at the wellhead  calculated by deducting from the selling price of such
         petroleum substances the cost of gathering,  transporting,  extracting,
         fractionating, dehydrating, processing, treating or otherwise rendering
         merchantable the petroleum substances, including a reasonable return on
         plant, gathering and processing facilities investment.

2.  Harbour  hereby  undertakes  and  agrees to pay to the  Geologist  a certain
overriding royalty (hereinafter called "the royalty") as set out in Schedule "A"
hereto,  of Harbour's  undivided  working  interest in the

<PAGE>

said lands from which Harbour has the right to recover,  remove, treat, sell and
dispose of the petroleum substances within, upon or under the said lands and any
renewal or renewals thereof.

3. Such  overriding  royalties on the said lands shall be  calculated  as herein
specified  on the  petroleum  substances  or any of them,  produced,  saved  and
marketed from Harbour's  undivided working interest in the said lands, and shall
be paid by Harbour to the  Geologist on or before the last day of each month for
all crude oil,  crude  naptha,  natural gas and plant  products  sold during the
previous month as follows:

(a)      Crude Oil: The  applicable  royalty  percentage  of the market value of
         crude oil and crude naptha marketed;

(b)      Natural Gas: The applicable  royalty  percentage of the market value of
         natural gas marketed.

(c)      Plant Products: In the event that natural gas is transported to a plant
         for  the  purpose  of  extracting  natural  gasoline  therefrom  or  of
         extracting,  condensing  or saving  additional  petroleum  products  or
         sulphur; the applicable royalty percentage of the market value received
         by Harbour on such plant products.

4. Notwithstanding anything to the contrary herein contained or implied, Harbour
shall be  entitled  to use free from the  payment  of  royalty  such part of the
production of any petroleum  substances  required and used by Harbour and/or its
agents in carrying out petroleum  and natural gas  operations,  including  plant
operations.

5. Harbour shall at all times keep  complete and accurate  records of production
from the said lands and the sale  thereof,  and said records  shall be available
for inspection by the Geologist and his authorized  representatives  at mutually
convenient times during normal business hours.

6. Pooling and Unitization: Harbour at any time and from time to time shall have
the right to include  the said lands or any part or parts  thereof and as to all
or any of the leased  substances  and/or  petroleum  and natural  gas, in a unit
operation or pooling agreement entered into by non-associated  companies dealing
at arms length for the unitised or pooled  development  and/or operation thereof
with other lands, if such becomes  necessary or desirable in the sole opinion of
Harbour.  In addition,  Harbour  shall have the right from time to time in their
sole  discretion to alter,  amend,  extend or cancel any such unit  operation or
pooling  agreement.  The  basis  and  manner of  allocating  unitised  or pooled
production  among  several  tracts of unitised or pooled land and the content of
any such operating  agreement shall be in the sole discretion and  determination
of Harbour and if exercised bona fide shall be binding upon the Geologist.  Upon
any such unitization or pooling the royalty payable in respect of production and
sale of the  leased  substances  from any  portion  of the said lands set out in
Schedule  "A" hereto so unitised or pooled  shall be  calculated  as provided in
Clause 3 hereof on the value of  production  or  unitised  or pooled  substances
produced  and sold  from  the  unit and  allocated  under  such  unit  operating
agreement  to that  portion of the said lands  included in the unit from time to
time.

7. The  Geologist  shall own and at its own expense  take in kind or  separately
dispose of its royalty share of the petroleum substances. If, and for so long as
the geologist  fails to take its royalty in kind,  or if it so directs  Harbour,
Harbour  shall  dispose  of the  Geologist's  royalty  share  of  the  petroleum
substances  at the same price and on the same terms as Harbour  received for its
own share of the petroleum substances,  or at such price as Harbour, acting as a
reasonably  prudent  operator  and  having  regard  to  current  market  prices,
availability of markets and economic conditions affecting the petroleum industry
generally  would dispose of its own share of the petroleum  substances.  Harbour
may, in such case enter into a contract  for the  disposition  of the  petroleum
substances,  but any such contract shall be only for such  reasonable  period of
time as is  consistent  with the  immediate  needs  of the  industry  under  the
circumstances.  Subject to the sales  contract,  the  geologist  may commence or
resume  taking its share of petroleum  substances  in kind by giving thirty (30)
days  written  notice to Harbour  of its  desire to  exercise  this  right.  The
Geologist  may not exercise this right more often than once in any six (6) month
period.  If  Harbour  does  not  dispose  of the  Geologist's  royalty  share of
petroleum substances,  the Geologist shall at its own expense provide facilities
for the taking thereof.

8. In the event Harbour shall assign, convey, farmout or lease their interest in
the petroleum  substances within, upon or under the said lands or any of them or
in any portion  thereof,  it will cause to be inserted in any such instrument of
assignment,  conveyance, farmout or lease an express provision whereby assignee,
purchaser  farmee or lessee  thereof  shall  assume and agree to perform  and be
bound by all the terms of this Agreement to the extent of the term of the estate
hereby created.

                                       2
<PAGE>

9. In the event the  Geologist  wishes to  dispose  of the  royalty to any other
party,  the  Geologist  shall give  notice of its  intention  to dispose of such
royalty  and the price at which it wishes to  dispose  of the  royalty.  Harbour
shall  have  thirty  (30) days from the date of  receipt  of the said  notice to
decide  whether it wishes to acquire the royalty at the price  contained  in the
notice.  If Harbour  desires to purchase the royalty at the price  stipulated in
the said notice, the Geologist shall be obligated to sell the same to Harbour at
such price.  If Harbour does not advise the Geologist  within the said (30) days
of its intention to buy the royalty at the price  stipulated in the said notice,
then the  Geologist  shall be  entitled to dispose of the royalty at a price not
less  favourable  than  stipulated in the said notice.  If the Geologist has not
disposed of the royalty on such terms within ninety (90) days of the termination
of the above  mentioned  thirty  (30) day notice  period,  it must  reoffer  any
intended disposition to Harbour with the same privileges and notice period being
in effect. In the event the Geologist assigns all or any part of its interest in
the royalty, Harbour shall not become liable to make payments, render statements
or permit audits in respect of the  overriding  royalty to more than one person.
If the royalty is at any time owned by more than one person,  such persons shall
nominate  one  person to act as a common  trustee  for  receipt  of the  royalty
payable hereunder and otherwise to deal with Harbour in respect to such royalty.

10. Nothing in this Agreement  shall require  Harbour to perform any work on the
said lands or leases  thereon  and Harbour may at any time and from time to time
surrender the said leases or any severable part thereof  without prior notice to
the Geologist.

11. The parties  hereto  shall from time to time and at all times do all further
acts and execute and deliver all such  further  deeds and  documents as shall be
reasonably  required  in order to fully  perform  and  carry  out the  terms and
provisions of this Agreement.

12. The address for service of notices,  correspondence  and reports required to
be served by one party upon the other to this Agreement shall be as follows:

         HARBOUR PETROLEUM COMPANY LIMITED
         3025 - 400 - 4th Avenue S.W.
         Calgary, Alberta
         T2P 0J4

         N.D.G. SMITH
         87 Berwick Crescent N.W.
         Calgary, Alberta

Any notice  required  to be served  hereunder  shall be deemed to have been duly
served on the second business day next following the mailing hereof by the party
giving the same by prepaid  registered  mail duly  addressed as aforesaid to the
party upon whom the same is served;  provided that any notices delivered by hand
shall be deemed to have been served as of delivery thereof.

In the  event  that post  office  mail  service  is for any  reason  temporarily
suspended,  notice shall be  delivered by hand.  Any party hereto may change its
address  for  service  by  notice  served  upon the  other  party in the  manner
aforesaid.

13.  This  Agreement  shall  continue  in full  force  and  effect as long as an
interest in the lands  subject to this  Agreement,  or any of them,  is owned by
Harbour, its successors,  or assigns,  provided that land surrendered by Harbour
shall no longer be subject to this Agreement.

14. Time shall be of the essence of this Agreement.

15. This Agreement shall enure to the benefit of and be binding upon the parties
hereto and their respective successors and assigns.

16. This Agreement  supercedes  all other  agreements,  documents,  writings and
verbal  understandings  among  the  parties  relating  to  the  said  lands  and
prospectus.

                                       3
<PAGE>

                  IN WITNESS  WHEREOF the  parties  hereto  have  executed  this
Agreement as of the day and year first above written.

                                           HARBOUR PETROLEUM COMPANY LIMITED

                                           /s/President
                                           ----------------------
                                           /s/Secretary
                                           ----------------------
/s/Richard W. DeVries                      /s/ N.D.G. Smith
----------------------                     ----------------------
Richard W. DeVries                         N.D.G. Smith

                                       4

<PAGE>

                THIS IS SCHEDULE "A" ATTACHED TO AND FORMING PART
                    OF AN OVERRIDING ROYALTY AGREEMENT DATED
                THE 4TH DAY OF AUGUST, A.D. 1981, BETWEEN HARBOUR
                   PETROLEUM COMPANY LIMITED AND N.D.G. SMITH

                                                      The Applicable
Prospect                 Said Lands                 Royalty Percentage
--------                 ----------                 ------------------

Marsh Creek              TWP 60 RGE 19 W5M                  2%
                         ----------------

                         Section 19:  All

Carson Creek             TWP 62 RGE 12 W5M                  2%
                         -----------------
                         Section 20:  N1/2
                         Section 21:  N1/2
                         Section 28:  All
                         Section 29:  All
                         Section 30:  All
                         Section 31:  All
                         Section 32:  All
                         Section 33:  All

                         TWP 63 RGE 12 W5M
                         -----------------
                         Section 4:  All
                         Section 5:  All
                         Section 6:  All

Edgerton                 TWP 42 RGE 3  W4M                  2%
                         ------------------
                         Section 32:  All
                         Section 33:  N1/2 & SE1/4

Pigeon                   TWP 47 RGE 1  W5M
                         -----------------
                         Section 14:  All
                         Section 15:  Portion NE1/4  (161.0 acres)
                         Section 15:  Portion NE1/4  (55.7 acres)
                         Section 15:  Portion SE1/4  (109.8 acres)
                         Section 21:  Portion N1/4  (232.7 acres)
                         Section 21:  Portion NW1/4  (4.7 acres)
                         Section 21:  Portion SE1/4  (21.2 acres)
                         Section 21:  Portion NE1/4  (82.6 acres)
                         Section 21:  Portion E1/4  (103.8 acres)
                         Section 22:  Portion SW1/4  (160.0 acres)

Taber Southeast          TWP 7  RGE 15 W4M                  1%
                         -----------------
                         Section 31:  N1/2

Hildon                   TWP 37 RGE 25 W4M                  1%
                         -----------------
                         Section 24:  All
<PAGE>

Goose River              TWP 67 RGE 18 W4M                  1%
                         -----------------
                         Section 1:  All
                         Section 2:  All
                         Section 11:  All
                         Section 12:  All
                         Section 13:  All
                         Section 14:  All
                         Section 23:  All
                         Section 24:  All

Snipe Lake               TWP 69 RGE 18 W5M                  1%
                         -----------------
                         Section 30:  E1/2
                         Section 31:  All

                         TWP 69 RGE 19 W5M
                         -----------------
                         Section 36:  All

                         TWP 70 RGE 18 W5M
                         -----------------
                         Section 6:  S1/2

                         TWP 70 RGE 18 W5M
                         -----------------

                         Section 8:  N1/2
                         Section 9:  N1/2
                         Section 17:  All
                         Section 18:  All
                         Section 19:  All
                         Section 20:  All

Alix North               TWP 40 RGE 24 W4M                  2%
                         -----------------
                         Section 26:  All
                         Section 27:  SE1/4
                         Section 34:  All
                         Section 35:  All

                         TWP 41 RGE 24 W4M                  2%
                         -----------------
                         Section 3:  SW1/4
                         Section 4:  All
                         Section 9:  SW1/4

Killarney                TWP 42 RGE 3  W4M                  2%
                         -----------------
                         Section 33:  SW1/4

Edgerton "27"            TWP 42 RGE 3  W4M                  2%
                         -----------------
                         Section 27:  All

                                       2
<PAGE>
                         TWP 42 RGE 3 W4M
                         ----------------
Black Creek              Section 31:  All

Nevis                    TWP 39 RGE 23 W4M                  2%
                         -----------------
                         Section 10:  All
                         Section 11:  All
                         Section 14:  All
                         Section 15:  All
                         Section 21:  All
                         Section 22:  AllExhibit 1

                    AMENDED AND RESTATED EMPLOYMENT AGREEMENT

      This Amended and Restated Employment Agreement (the "Agreement"), is
entered into as of October 6, 2000, between SIGA TECHNOLOGIES, INC., a Delaware
corporation (with its successors and assigns, referred to as the "Corporation")
and Joshua D. Schein (referred to as "Schein").

      WHEREAS, the Corporation and Schein are parties to an Employment Agreement
dated as of January 19, 2000 (the "Original Agreement"); and

      WHEREAS, the Corporation and Schein have agreed to amend and restate the
Original Agreement in order to add certain change of control provisions and make
other modifications.

      NOW, THEREFORE, in consideration of the foregoing premises and of the
mutual agreements and covenants hereinafter set forth, the parties hereto agree
to the terms and conditions of this Agreement as follows:

            1. Employment for Term. The Corporation hereby employs Schein and
Schein hereby accepts employment with the Corporation for the period beginning
on January 19, 2000 and ending January 19, 2005. (the "Initial Term"), or upon
the earlier termination of the Term pursuant to Section 6. This Agreement shall
be automatically renewed for additional one-year periods (the "Renewal Terms;"
together with the Initial Term, the "Term") unless either party notifies the
other in writing of its intention not to so renew this Agreement no less than
180 days prior to the expiration of the Initial Term or a Renewal Term. The
termination of Schein's employment under this Agreement shall end the Term but
shall not terminate Schein's or the Corporation's other agreements in this
Agreement, except as otherwise provided herein.

      2. Position and Duties. During the Term, Schein shall serve as Chief
Executive Officer of the Corporation. During the Term, Schein shall also hold
such additional positions and titles as the Board of Directors of the
Corporation (the "Board") may determine from time to time. During the Term,
Schein shall devote as much time as is necessary to satisfactorily perform his
duties as an employee of the Corporation.

      3. Compensation.

            (a) Base Salary. The Corporation shall pay Schein a base salary,
beginning on the first day of the Term and ending on the last day of the Term,
of not less than $250,000 per annum, payable at least monthly on the
Corporation's regular pay cycle for professional employees (the "Base Salary").

            (b) Stock Options. Pursuant to the Corporation's stock option plan
and subject to stockholder approval of the Corporation's Amended 1996 Incentive
and Non-Qualified Stock Option Plan (the "Plan"), the Corporation shall grant to
Schein fully-vested options to purchase 500,000 shares of the Corporation's
Common Stock exercisable at $2.00 per share, the closing bid price of the Common
Stock of the Corporation on January 19, 2000 (the "Options"). The Options shall
expire on January 19, 2010. In the event the Plan is not approved by the
stockholders at the Corporation's 2000 Annual Meeting, the Corporation shall
grant to Schein such Options outside of the Plan with the same terms and
conditions as if granted pursuant to the Plan.

            (c) Annual Increases. The Base Salary shall be increased at the end
of each year of service by the greater of (i) 5% or (ii) a percentage equal to
the increase, if any, in the United States Department of Labor Consumer Price
Index (or comparable index, if available) for the New York metropolitan area
over the previous 12 months.

                                       1
<PAGE>

            (d) Other and Additional Compensation. The preceding sections
establish the minimum compensation during the Term and shall not preclude the
Board from awarding Schein a higher salary or any bonuses or stock options in
the discretion of the Board during the Term at any time. The Corporation will
adopt a bonus plan and Schein will be eligible to participate in such plan. The
Corporation shall pay Schein a monthly car allowance of $500.

      4. Employee Benefits. During the Term, Schein shall be entitled to the
employee benefits including vacation, 401(k) plan, health plan and other
insurance benefits made available by the Corporation to any other officers or
key employees of the Corporation.

      5. Expenses. The Corporation shall reimburse Schein for actual
out-of-pocket expenses incurred by him in the performance of his services for
the Corporation upon the receipt of appropriate documentation of such expenses.

      6. Termination.

            (a) General. The Term shall end immediately upon Schein's death. The
Term may also end for Cause or Disability, as defined in Section 7.

            (b) Notice of Termination. Promptly after it ends the Term, the
Corporation shall give Schein notice of the termination, including a statement
of whether the termination was for Cause or Disability (as defined in Section
7(a) and 7(b) below). The Corporation's failure to give notice under this
Section 6(b) shall not, however, affect the validity of the Corporation's
termination of the Term.

            (c) Effective Termination by the Corporation. If the Corporation
reassigns Schein's base of operations outside of New York City, or materially
reduces Schein's duties during the term, including replacing Schein as Chief
Executive Officer, then, at his option, Schein may treat such reduction in
duties as a termination of the Term without Cause by the Corporation.

      7. Severance Benefits.

            (a) Cause Defined. "Cause" means (i) willful malfeasance or willful
misconduct by Schein in connection with his employment; (ii) Schein's gross
negligence in performing any of his duties under this Agreement; (iii) Schein's
conviction of, or entry of a plea of guilty to, or entry of a plea of nolo
contendre with respect to, any crime other than a traffic violation or
infraction which is a misdemeanor; (iv) Schein's material breach of any written
policy applicable to all employees adopted by the Corporation which is not cured
to the reasonable satisfaction of the Corporation within fifteen (15) business
days after notice thereof; or (v) material breach by Schein of any of his
agreements in this Agreement which is not cured to the reasonable satisfaction
of the Corporation within fifteen (15) business days after notice thereof.

            (b) Disability Defined. "Disability" shall mean Schein's incapacity
due to physical or mental illness that results in his being substantially unable
to perform his duties hereunder for six consecutive months (or for six months
out of any nine month period). During a period of Disability, Schein shall
continue to receive his base salary hereunder, provided that if the Corporation
provides Schein with disability insurance coverage, payments of Schein's base
salary shall be reduced by the amount of any disability insurance payments
received by Schein due to such coverage. The Corporation shall give Schein
written notice of termination which shall take effect sixty (60) days after the
date it is sent to Schein unless Schein shall have returned to the performance
of his duties hereunder during such sixty (60) day period (whereupon such notice
shall become void).

                                        2
<PAGE>

            (c) Termination. If the Corporation ends the Term for Cause or
Disability, or if Schein resigns as an employee of the Corporation for reasons
other than a material breach by the Corporation of its obligations under this
Agreement or a material reduction of Schein's duties as provided in Section
6(c), or if Schein dies, then the Corporation shall have no obligation to pay
Schein any amount, whether for salary, benefits, bonuses, or other compensation
or expense reimbursements of any kind, accruing after the end of the Term, and
such rights shall, except as otherwise required by law, be forfeited immediately
upon the end of the Term, except that payments under Section 3(a) shall continue
for the remainder of the Term unless the Corporation ends the Term for Cause or
if Schein resigns for reasons other than a material breach by the Corporation of
its obligations under this Agreement or a material reduction of his duties as
provided in Section 6(c). If the Corporation ends the Term without Cause, then
the Corporation will be obligated to continue to pay Schein's salary and all
other amounts due hereunder for the remainder of the Term.

      8. Change of Control Payment. The provisions of this paragraph 8 set forth
the terms of an agreement reached between Schein and the Corporation regarding
Schein's rights and obligations upon the occurrence of a "Change in Control" (as
hereinafter defined) of the Corporation. These provisions are intended to assure
and encourage in advance Schein's continued attention and dedication to his
assigned duties and his objectivity during the pendency and after the occurrence
of any such Change in Control. These provisions shall apply in lieu of, and
expressly supersede, the provisions of paragraph 7(c) if Schein's employment is
terminated or Notice of Termination is given ninety (90) days prior to or within
eighteen (18) months after the occurrence of an event constituting a Change in
Control.

            (a) Escrow. Within ten (10) days after the occurrence of the first
      event constituting a Change in Control (irrespective of whether Schein has
      actual knowledge of such event), the Corporation shall place immediately
      negotiable funds in escrow in an amount equal to Schein's salary and all
      other amount due hereunder for the remainder of the Term, plus such
      additional amount as equals the "Gross Up Payment" (as hereinafter
      defined) thereon (the "Change of Control Amount"). Such escrow shall be
      conducted pursuant to a standard escrow agreement among the Corporation,
      Schein and an independent escrow agent providing for the timely payment to
      Schein of the amounts hold in such escrow in the event Schein becomes
      entitled thereto under the applicable provisions of this Agreement (the
      "Escrow Arrangement"). The Escrow Arrangement shall be maintained until
      the earlier of (A) nineteen (19) months after the occurrence of an event
      constituting a Change in Control or (B) the payment to Schein of all sums
      escrowed.

      (b) Change In Control. If, within 90 days prior to, or within eighteen
      (18) months after the occurrence of an event constituting a Change in
      Control, Schein's employment is terminated or a Notice of Termination is
      given for any reason other than (A) his death, (B) his Disability, or (C)
      by Schein without Cause on the part of the Corporation, then such
      termination shall be deemed to be a "Termination Due to Change in Control
      (herein so called), in which event the Corporation shall pay Schein, in a
      lump sum, on or prior to the fifth (5th) day following the date of
      termination of the Term:

            (1)   an amount equal to the Change of Control Amount (including any
                  Gross Up Payment); and

            (2)   Schein's accrued and unpaid base salary.

      (c) Stock Option Floor. Upon the occurrence of the first event
      constituting a Change in Control, all stock options and other stock-based
      grants to Schein by the Corporation shall, irrespective of any provisions
      of his option agreements, immediately and irrevocably vest and become
      exercisable as of the date of such first event whereupon, at any time
      during the Option Term as defined in the option agreements, Schein or his
      estate may by five (5) days' advance written notice given to the
      Corporation, and irrespective of whether Schein is then employed by

                                        3
<PAGE>

      the Corporation or then living, and solely at the election of Schein or
      his estate, require the Corporation to:

            (1) within thirty (30) days of a request by Schein or his estate
            file and cause to become effective a Form S-8 (or other appropriate
            form) with the Securities and Exchange Commission ("SEC")
            registering for resale all shares underlying stock options granted
            to Schein and outstanding with all fees and expenses of such filing
            being paid by the Corporation, or,

            (2) allow Schein to exercise all or any part of such Stock Options
            at the option prices therefor specified in the grant of the Stock
            Options.

                  In the event the Corporation does not file and cause to become
            effective a Form S-8 (or other appropriate form) with the SEC within
            the thirty (30) day time period, the Corporation shall pay
            liquidated damages to Schein or his estate equal to the greater of
            (a) the amount equal to the difference between the Market Price of
            the Corporation's common stock and the exercise price of the stock
            options multiplied by the aggregate number of stock options
            outstanding or (b) $500,000. For purposes of this Section 8(c),
            Market Price is defined as the average of the closing bid and ask
            price of the Corporation's common stock on the Nasdaq SmallCap
            Market or the closing sale price of the common stock on a national
            exchange, if listed on such exchange, in each case, on the day prior
            to the date of the Corporation's breach of this Section 8(c).

      (d)   Gross Up Payment.

            (1) Excess Parachute Payment. If Schein incurs the tax (the "Excise
            Tax") imposed by Section 4999 of the Internal Revenue Code of 1986
            (the "Code") on "Excess Parachute Payments" within the meaning of
            Section 28OG(b)(1) of the Code, the Corporation will pay to Schein
            an amount (the "Gross Up Payment") such that the net amount retained
            by Schein, after deduction of any Excise Tax on both the Excess
            Parachute Payment and any federal, state and local income tax
            (together with penalties and interest) as well as the Excise Tax
            upon the payment provided for by this subparagraph 8(d)(1), will be
            equal to the Change of Control Amount.

            (2) Applicable Rates. For purposes of determining the amount of the
            Gross Up Payment, Schein will be deemed to pay federal income taxes
            at the highest marginal rate of federal income taxation in the
            calendar year in which the Gross Up Payment is to be made and state
            and local income taxes at the highest marginal rates of taxation in
            the state and locality where taxes thereon are lawfully due, net of
            the maximum reduction (if any) in federal income taxes that could be
            obtained from deduction of deductible state and local taxes.

            (3) Determination of Gross Up Payment Amount. The determination of
            whether the Excise Tax is payable and the amount thereof will be
            based upon the opinion of tax counsel selected by Schein and
            reasonably approved by the Corporation, which approval will not be
            unreasonably withheld or delayed. If such opinion is not finally
            accepted by the Internal Revenue Service (or state and local taxing
            authorities), then appropriate adjustments to the Excise Tax will be
            computed and additional Gross Up Payments will be made in the manner
            provided by this subparagraph (d).

            (4) Payment. The Corporation will pay the estimated amount of the
            Gross Up Payment in cash to Schein at the time specified in this
            Agreement. Schein and the Corporation agree to reasonably Scheinate
            in the determination of the actual amount of the Gross Up Payment.
            Further, Schein and the Corporation agree to make such adjustments
            to the estimated amount of the Gross Up Payment as may be necessary
            to equal the actual amount of the Gross Up Payment, which in the
            case of the Corporation

                                        4
<PAGE>

            will refer to refunds of prior overpayments by the Corporation and
            in the case of Schein will refer to additional payments to Schein to
            make up for prior underpayments.

      (e)   Definitions. For purposes of this paragraph 8, the following terms
            shall have the following meanings:

            "Change in Control" shall mean any of the following:

            (1) the acquisition by any individual, entity, or group (within the
            meaning of Section 13(d)(3) or 14(d)(2) of the Exchange Act) (the
            "Acquiring Person"), other than the Corporation, or any of its
            Subsidiaries or any Excluded Group (as defined herein), of
            beneficial ownership (within the meaning of Rule 13d-3- promulgated
            under the Exchange Act) of 35% or more of the combined voting power
            or economic interests of the then outstanding voting securities of
            the Corporation entitled to vote generally in the election of
            directors; provided however, that any transfer from any director or
            executive officer listed in the Company's Form 10-KSB for the year
            ended December 31, 1999 under "Security Ownership of Certain
            Beneficial Owners" (the "Excluded Group") will not result in a
            Change in Control if such transfer was part of a series of related
            transactions the effect of which, absent the transfer to such
            Acquiring Person by the Excluded Group, would not have resulted in
            the acquisition by such Acquiring Person of 35% or more of the
            combined voting power or economic interests of the then outstanding
            voting securities; or

            (2) during any period of 12 consecutive months after the date of
            this Amendment, the individuals who at the beginning of any such
            12-month period constituted a majority of the Directors (the
            "Incumbent Non-Investor Majority") cease for any reason to
            constitute at least a majority of such Directors; provided that (i)
            any individual becoming a director whose election, or nomination for
            election by the Corporation's stockholders, was approved by a vote
            of the stockholders having the right to designate such director and
            (ii) any director whose election to the Board or whose nomination
            for election by the stockholders of the Corporation was approved by
            the requisite vote of directors entitled to vote on such election or
            nomination in accordance with the Restated Certificate of
            Incorporation of the Corporation, shall, in each such case, be
            considered as though such individual were a member of the Incumbent
            Non-Investor Majority, but excluding, as a member of the Incumbent
            Non-Investor Majority, any such individual whose initial assumption
            of office is in connection with an actual or threatened election
            contest relating to the election of the directors of the Corporation
            (as such terms are used in Rule 14a-2 of Regulation 14A promulgated
            under the Exchange Act) and further excluding any person who is an
            affiliate or associate of an Acquiring Person having or proposing to
            acquire beneficial ownership of 25% or more of the combined voting
            power of the then outstanding voting securities of the Corporation
            entitled to vote generally in the election of directors; or

            (3) the approval by the stockholders of the Corporation of a
            reorganization, merger or consolidation, in each case, with respect
            to which all or substantially all of the individuals and entities
            who were the respective beneficial owners of the voting securities
            of the Corporation immediately prior to such reorganization, merger,
            or consolidation do not, following such reorganization, merger, or
            consolidation, beneficially own, directly or indirectly, more than
            50% of the combined voting power of the then outstanding voting
            securities entitled to vote generally in the election of directors
            of the Corporation resulting from such reorganization, merger, or
            consolidation; or

            (4) the sale or other disposition of assets representing 50% or more
            of the assets of the Corporation in one transaction or series of
            related transactions not initiated or commenced by any person within
            the Excluded Group; or

                                        5
<PAGE>

            (5)   a "Fundamental Change in Business" as hereinafter defined; or

            (6)   a "Hostile Takeover" as hereinafter defined is declared.

            "Fundamental Change in Business" shall mean that the Corporation, at
      any time, no longer spends at least fifty percent (50%) of its annual
      budget on activities related to biotechnology or pharmaceuticals.

            "Hostile Takeover" shall mean any Change in Control which at any
      time is declared by at least a majority of the Board, directly or
      indirectly, to be hostile or not in the best interests of the Corporation,
      or in which an attempt is made (irrespective of whether successful) to
      wrest control away from the incumbent management of the Corporation, or
      with respect to which the Board makes any effort to resist.

      9. Confidentiality, Ownership, and Covenants.

            (a) "Corporation Information" and "Inventions" Defined. "Corporation
Information" means all information, knowledge or data of or pertaining to (i)
the Corporation, its employees and all work undertaken on behalf of the
Corporation, and (ii) any other person, firm, corporation or business
organization with which the Corporation may do business during the Term, that is
not in the public domain (and whether relating to methods, processes,
techniques, discoveries, pricing, marketing or any other matters). "Inventions"
collectively refers to any and all inventions, trade secrets, ideas, processes,
formulas, source and object codes, data, programs, other works of authorship,
know-how, improvements, research, discoveries, developments, designs, and
techniques regarding any of the foregoing.

            (b) Confidentiality. (i) Schein hereby recognizes that the value of
all trade secrets and other proprietary data and all other information of the
Corporation not in the public domain disclosed by the Corporation in the course
of his employment with the Corporation may be attributable substantially to the
fact that such confidential information is maintained by the Corporation in
strict confidentiality and secrecy and would be unavailable to others without
the expenditure of substantial time, effort or money. Schein, therefore, except
as provided in the next two sentences, covenants and agrees that all Corporation
Information shall be kept secret and confidential at all times during the Term
and for the five (5) year period after the end of the Term and shall not be used
or divulged by him outside the scope of his employment as contemplated by his
Agreement, except as the Corporation may otherwise expressly authorize by action
of the Board. In the event that Schein is requested in a judicial,
administrative or governmental proceeding to disclose any of the Corporation
Information, Schein will promptly so notify the Corporation so that the
Corporation may seek a protective order of other appropriate remedy and/or waive
compliance with this Agreement. If disclosure of any of the Corporation
Information is required, Schein may furnish the material so required to be
furnished, but Schein will furnish only that portion of the Corporation
Information that legally is required.

            (ii) Schein also hereby agrees to keep the terms of this Agreement
confidential to the same extent that the Corporation maintains such
confidentiality (except with regard to any disclosure by the Corporation
required under applicable securities laws).

            (c) Ownership of Inventions, Patents and Technology. Schein hereby
assigns to the Corporation all of Schein's rights (including patent rights,
copyrights, trade secret rights, and all other rights throughout the world),
title and interest in and to Inventions, whether or notpatentable or registrable
under copyright or similar statutes, made or conceived or reduced to practice or
learned by Schein, either alone or jointly with others, during the course of the
performance of services for the Corporation. Schein shall also assign to, or as
directed by, the Corporation, all of Schein's right, title and interest in and
to any and all Inventions, the full title to which is required to be in the
United States government of any of its agencies. The Corporation shall have all
right, title and interest in all research and work product produced by Schein as
an employee of the Corporation, including, but not limited to, all research
materials and lab books.

                                       6
<PAGE>

            (d) Non-Competition Period Defined. "Non-Competition Period" means
the period beginning at the end of the Term and ending one (1) year after the
end of the Term.

            (e) Covenants Regarding the Term and Non-Competition Period. Schein
acknowledges and agrees that his services pursuant to this Agreement are unique
and extraordinary; that the Corporation will be dependent upon Schein for the
development of its products; and that he will have access to and control of
confidential information of the Corporation. Schein further acknowledges that
the business of the Corporation is international in scope and cannot be confined
to any particular geographic area. For the foregoing reasons and to induce the
Corporation to enter this Agreement, Schein covenants and agrees that, subject
to Section 9(h), during the Term and the Non-Competition Period Schein shall not
unless with written consent of the Corporation:

      (i)   engage in any business related to the research and development of
            the products or processes in which the Corporation is engaged in
            during the Term or in any other business conducted by the
            Corporation during the Term (collectively the "Prohibited Activity")
            in the World for his own account;

      (ii)  become interested in any individual, corporation, partnership or
            other business entity (a "Person") engaged in any Prohibited
            Activity in the World, directly or indirectly, as an individual,
            partner, shareholder, officer, director, principal, agent, employee,
            trustee, consultant or in any other relationship or capacity;
            provided, however, that Schein may own directly or indirectly,
            solely as an investment, securities of any Person which are traded
            on any national securities exchange if Schein (x) is not a
            controlling person of, or a member of a group which controls, such
            person or (y) does not, directly or indirectly, own 5% or more of
            any class of securities of such person; or

      (iii) directly or indirectly hire, employ or retain any person who at any
            time during the Term was an employee of the Corporation or directly
            or indirectly solicit, entice, induce or encourage any such person
            to become employed by any other person.

            (f) Remedies. Schein hereby acknowledges that the covenants and
agreements contained in Section 9 are reasonable and valid in all respects and
that the Corporation is entering into this Agreement, inter alia, on such
acknowledgement. If Schein breaches, or threatens to commit a breach, of any of
the Restrictive Covenants, the Corporation shall have the following rights and
remedies, each of which rights and remedies shall be independent of the other
and severally enforceable, and all of which rights and remedies shall be in
addition to, and not in lieu of, any other rights and remedies available to the
Corporation under law or in equity: (i) the right and remedy to have the
Restrictive Covenants specifically enforced by any court having equity
jurisdiction, it being acknowledged and agreed that any such breach or
threatened breach will cause irreparable injury to the Corporation and that
money damages will not provide an adequate remedy to the Corporation; (ii) the
right and remedy to require Schein to account for and pay over to the
Corporation such damages as are recoverable at law as the result of any
transactions constituting a breach of any of the Restrictive Covenants; (iii) if
any court determines that any of the Restrictive Covenants, or any part thereof,
is invalid or unenforceable, the remainder of the Restrictive Covenants shall
not thereby be affected and shall be given full effect, without regard to the
invalid portions; and (iv) if any court construes any of the Restrictive
Covenants, or any part thereof, to be unenforceable because of the duration of
such provision or the area covered thereby, such court shall have the power to
reduce the duration or area of such provision and, in its reduced form, such
provision shall then be enforceable and shall be enforced.

            (g) Jurisdiction. The parties intend to and hereby confer
jurisdiction to enforce the Restrictive Covenants upon the courts of any
jurisdiction within the geographical scope of such Covenants. If the courts of
any one or more such jurisdictions hold the Restrictive Covenants wholly
unenforceable by reason of the breadth of such scope or otherwise, it is the
intention of the parties that such determination not bar or in any way affect
the Corporation's right to the relief provided above in the courts of any other
jurisdiction, within the geographical scope of such Covenants, as to breaches of
such Covenants in such

                                        7
<PAGE>

other respective jurisdiction such Covenants as they relate to each jurisdiction
being, for this purpose, severable into diverse and independent covenants.

            (h) Schein's agreements and covenants under Section 9(e) shall
automatically terminate if the Corporation ends the Term without Cause or Schein
resigns due to a material breach by the Corporation of its obligations under
this Agreement or a material reduction of Schein's duties as provided in Section
6(c).

      10. Successors and Assigns.

            (a) Schein. This Agreement is a personal contract, and the rights
and interests that the Agreement accords to Schein may not be sold, transferred,
assigned, pledged, encumbered, or hypothecated by him. All rights and benefits
of Schein shall be for the sole personal benefit of Schein, and no other person
shall acquire any right, title or interest under this Agreement by reason of any
sale, assignment, transfer, claim or judgement or bankruptcy proceedings against
Schein. Except as so provided, this Agreement shall inure to the benefit of and
be binding upon Schein and his personal representatives, distributes and
legatees.

            (b) The Corporation. This Agreement shall be binding upon the
Corporation and inure to the benefit of the Corporation and of its successors
and assigns, including (but not limited to) any corporation that may acquire all
or substantially all of the corporation's assets or business or into or with
which the Corporation may be consolidated or merged. In the event that the
Corporation sells all or substantially all of its assets, merges or
consolidates, otherwise combines or affiliates with another business, dissolves
and liquidates, or otherwise sells or disposes of substantially all of its
assets and Schein does not elect to treat any such transaction as a termination
by the Corporation without Cause pursuant to Section 7(c), then this Agreement
shall continue in full force and effect. The Corporation's obligations under
this Agreement shall cease, however, if the successor to, the purchaser or
acquirer either of the Corporation or of all or substantially all of its assets,
or the entity with which the Corporation has affiliated, shall assume in writing
the Corporation's obligations under this Agreement (and deliver and executed
copy of such assumption to Schein), in which case such successor or purchaser,
but not the Corporation, shall thereafter be the only party obligated to perform
the obligations that remain to be performed on the part of the Corporation under
this Agreement.

      11. Transaction Fee. Upon the completion of a transaction resulting in a
Transaction (as defined herein) or any transaction described in Section 10(b),
the Corporation shall pay to Schein, in consideration of his work on behalf of
the Corporation, a one time cash payment equal to one and one-half percent
(1.5%) of the total consideration received by the Corporation. "Transaction"
shall mean any merger or consolidation of the Corporation into or with another
corporation, or any reorganization, recapitalization or like transaction or
series of transactions having substantially equivalent effect and purpose, at
the conclusion of which such merger, consolidation, reorganization,
recapitalization or like transaction the holders of the voting capital stock of
the Corporation immediately prior to such transaction or series of transactions
own less than a majority of the voting capital stock of the acquiring entity or
entity surviving or resulting from such transaction or series of transactions
immediately thereafter, or any sale, transfer or other disposition of all or
substantially all of the assets or capital stock of the Corporation.

      12. Sale, Merger or Spin-out of Subsidiary. Upon the sale, merger or
public spin-out of any wholly-owned or partially-owned subsidiary of the
Corporation, or of any material asset of the Corporation, Schein shall receive a
success fee equal to one and one-half percent (1.5%) of the value of the
Corporation's shares of the subsidiary, or of the value of the material asset,
upon the sale, merger or spinout. In the event the subsidiary or material asset
is sold for cash, the 1.5% success fee shall be paid for in cash. In the event
the subsidiary or material asset is sold for equity in another company, the 1.5%
success fee shall be paid for in the form of equity received by the Corporation.
In the event of a merger or public spin-out of the subsidiary or of any material
asset of the Corporation, the 1.5% success fee shall be paid for in the form of
shares of the subsidiary or in the form of equity received by the Corporation.

                                        8
<PAGE>

      13. Entire Agreement. This Agreement represents the entire agreement
between the parties concerning Schein's employment with the Corporation and
supersedes all prior negotiations, discussions, understanding and agreements,
whether written or oral, between Schein and the Corporation relating to the
subject matter of this Agreement.

      14. Amendment or Modification, Waiver. No provision of this Agreement may
be amended or waived unless such amendment or waiver is agreed to in writing
signed by Schein and by a duly authorized officer of the Corporation. No waiver
by any party to this Agreement or any breach by another party of any condition
or provision of this Agreement to be performed by such other party shall be
deemed a waiver of a similar or dissimilar condition or provision at the same
time, any prior time or any subsequent time.

      15. Notices. Any notice to be given under this Agreement shall be in
writing and delivered personally or sent by overnight courier or registered or
certified mail, postage prepaid, return receipt requested, addressed to the
party concerned at the address indicated below, or to such other address of
which such party subsequently may give notice in writing:

If to Schein:              Joshua D. Schein
                           420 Lexington Avenue
                           Suite 620
                           New York, NY 10170
                           Fax: 212-697-3130

If to the Corporation:     SIGA TECHNOLOGIES, INC.
                           420 Lexington Avenue
                           Suite 620
                           New York, NY 10170
                           Fax: 212-697-3130
                           Attention: Judson Cooper

with a copy to:            Akin, Gump, Strauss, Hauer & Feld, L.L.P.
                           590 Madison Avenue
                           New York, NY 10022
                           Attention: Jeffrey J. Fessler

Any notice delivered personally or by overnight courier shall be deemed given on
the date delivered and any notice sent by registered or certified mail, postage
prepaid, return receipt requested, shall be deemed given on the date mailed.

      16. Severability. If any provision of this Agreement or the application of
any such provision to any party or circumstances shall be determined by any
court of competent jurisdiction to be invalid and unenforceable to any extent,
the remainder of this Agreement or the application of such provision to such
person or circumstances other than those to which it is so determined to be
invalid and unenforceable shall not be affected, and each provision of this
Agreement shall be validated and shall be enforced to the fullest extent
permitted by law. If for any reason any provision of this Agreement containing
restrictions is held to cover an area or to be for a length of time that is
unreasonable or in any other way is construed to be too broad or to any extent
invalid, such provision shall not be determined to be entirely null, void and of
no effect; instead, it is the intention and desire of both the Corporation and
Schein that, to the extent that the provision is or would be valid or
enforceable under applicable law, any court of competent jurisdiction shall
construe and interpret or reform this Agreement to provide for a restriction
having the maximum enforceable area, time period and such other constraints or
conditions (although not greater than those contained currently contained in
this Agreement) as shall be valid and enforceable under the applicable law.

                                        9
<PAGE>

      17. Survivorship. The respective rights and obligations of the parties
hereunder shall survive any termination of this Agreement to the extent
necessary to the intended preservation of such rights and obligations.

      18. Headings. All descriptive headings of sections and paragraphs in this
Agreement are intended solely for convenience of reference, and no provision of
this Agreement is to be construed by reference to the heading of any section or
paragraph.

      19. Withholding Taxes. All salary, benefits, reimbursements and any other
payments to Schein under this Agreement shall be subject to all applicable
payroll and withholding taxes and deductions required by any law, rule or
regulation of and federal, state or local authority.

      20. 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 constitute one and same instrument.

      21. Applicable Law; Arbitration. The validity, interpretation and
enforcement of this Agreement and any amendments or modifications hereto shall
be governed by the laws of the State of New York, as applied to a contract
executed within and to be performed in such State. The parties agree that any
disputes shall be definitively resolved by binding arbitration before the
American Arbitration Association in New York, New York and consent to the
jurisdiction to the federal courts of the Southern District of New York or, if
there shall be no jurisdiction, to the state courts located in New York County,
New York, to enforce any arbitration award rendered with respect thereto. Each
party shall choose one arbitrator and the two arbitrators shall choose a third
arbitrator. All costs and fees related to such arbitration (and judicial
enforcement proceedings, if any) shall be borne by the unsuccessful party.

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

                                                   SIGA TECHNOLOGIES, INC.,

                                                   By: /s/ Judson Cooper
                                                      --------------------------
                                                      Judson Cooper
                                                      Executive Vice President

                                                      /s/ Joshua D. Schein
                                                      --------------------------
                                                       Joshua D. Schein

                                       10

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