Document:

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                                                                    EXHIBIT 10.2

                    AMENDMENT TO CONTINGENT WARRANT AGREEMENT

         THIS AMENDMENT TO CONTINGENT WARRANT AGREEMENT ("Agreement"), dated as
of August 31, 2000 is among Advanced Lighting Technologies, Inc., an Ohio
corporation (the "Company"), General Electric Company, a New York corporation
("Purchaser"), Wayne R. Hellman ("Hellman"), Hellman, Ltd., an Ohio limited
liability company ("Hellman Ltd."), Wayne R. Hellman, as voting trustee under
Voting Trust Agreement dated October 10, 1995, Alan J. Ruud ("Ruud"), and Alan
J. Ruud, as voting trustee under Voting Trust Agreement dated January 2, 1998.

         WHEREAS, the parties entered into a Contingent Warrant Agreement (the
"Agreement") dated September 30, 1999; and

         WHEREAS, the parties desire to amend the Agreement as provided in this
Amendment;

         NOW THEREFORE, in consideration of the mutual covenants contained
herein, the parties, intending to be legally bound, agree as follows:

         1. The Section 2.2a of the Agreement is hereby amended to read in its
entirety as follows:

                             a. The Company shall not permit the average of the
                  Company's EBITDA Ratio for any two consecutive fiscal
                  quarters, commencing with the average for the fiscal quarters
                  ending September 30, 1999 and December 31, 1999, and
                  continuing each fiscal quarter thereafter (each, a
                  "Determination Period") other than the two consecutive fiscal
                  quarters ended June 30, 2000 and the two consecutive fiscal
                  quarters ending September 30, 2000, neither of which shall be
                  a "Determination Period" for purposes of this Agreement, to be
                  less than the Required Ratio. Notwithstanding the fact that
                  the two fiscal quarters ended June 30, 2000 and the two fiscal
                  quarters ending September 30, 2000 do not constitute
                  Determination Periods, (i) the quarter ending September 30,
                  2000 shall be included in the Company's EBITDA Ratio for the
                  Determination Period ending December 31, 2000, (ii) each of
                  the quarters ended June 30, 2000 and September 30, 2000 shall
                  be a fiscal quarter for purposes of Section 2.2e of this
                  Agreement, and (iii) the Company shall be required to furnish
                  to Purchaser the report described in Section 2.2f of this
                  Agreement for the two consecutive fiscal quarters ended June
                  30, 2000 and the two consecutive fiscal quarters ending
                  September 30, 2000.

         2. All other provisions of the Agreement shall remain in full force and
effect.

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         IN WITNESS WHEREOF, partes hereto have each caused this Amendment to be
executed in the name and on behalf of each of them one of their respective
officers thereunto duly authorized, as of the date first above written.

                                        THE COMPANY:

                                        ADVANCED LIGHTING TECHNOLOGIES, INC.

                                        By: /s/ Wayne R. Hellman
                                            ---------------------------------
                                        Name: Wayne R. Hellman
                                              -------------------------------
                                        Title: Chief Executive Officer

                                        /s/ Wayne R. Hellman
                                        -------------------------------------
                                        Wayne R. Hellman

                                        /s/ Wayne R. Hellman
                                        -------------------------------------
                                        Wayne R. Hellman, as voting trustee
                                        under Voting Trust Agreement dated
                                        October 10, 1995, as amended

                                        HELLMAN LTD.

                                        By: /s/ Wayne R. Hellman
                                            ---------------------------------
                                        Its: Managing Member

                                        /s/ Alan J. Ruud
                                        -------------------------------------
                                        Alan J. Ruud

                                        /s/ Alan J. Ruud
                                        -------------------------------------
                                        Alan J. Ruud, as voting trustee under
                                        Voting Trust Agreement dated
                                        January 2, 1998, as amended

                                        PURCHASER:

                                        GENERAL ELECTRIC COMPANY

                                        By: /s/ R. M. Jackson, Jr.
                                        -------------------------------------
                                        Name: R. M. Jackson, Jr.
                                        -------------------------------------
                                        Title: VP, General Counsel GE Lighting
                                        -------------------------------------

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                                                                    Exhibit 10.1
                                                                    ------------

                                    AGREEMENT

                  THIS AGREEMENT (this "Agreement") is made, entered into and
effective as of September 25, 2000 (the "Retirement Date"), by and between
Gliatech Inc. (the "Company"), located at 23420 Commerce Park Road, Cleveland,
Ohio 44122 and Thomas O. Oesterling, Ph.D. ("Executive"), residing at 16940
Catsden Road, Chagrin Falls, Ohio 44023.

                                   WITNESSETH:

                  WHEREAS, prior to the Retirement Date Executive was a director
of and the President and Chief Executive Officer of the Company;

                  WHEREAS, effective on the Retirement Date, Executive retired
and resigned as a director and an employee of the Company, and from any and all
offices of the Company, and any other position, office or directorship of any
other entity for which Executive was serving at the request of the Company; and

                  WHEREAS, the Company accepts Executive's retirement and
resignation as of the date referenced above; and

                  WHEREAS, the Company and Executive desire to set forth the
payments and benefits that Executive will be entitled to receive from the
Company in connection with his retirement and resignation from employment with
the Company; and

                  WHEREAS, the Company and Executive wish to resolve, settle
and/or compromise certain matters, claims and issues between them, including,
without limitation, Executive's retirement and resignation from the offices he
held and from his employment with the Company.

                  NOW, THEREFORE, in consideration of the promises and
agreements contained herein and other good and valuable consideration, the
sufficiency and receipt of which are hereby acknowledged, and intending to be
legally bound, the Company and Executive hereby agree as follows:

         1. RETIREMENT AND RESIGNATION. Executive hereby retires from and
resigns, effective on the Retirement Date, his employment with the Company and
its subsidiaries and related or affiliated companies, and his position as
President and Chief Executive Officer of the Company. Executive further resigns,
effective on the Retirement Date: (a) as a director of the Company, (b) from all
other offices of the Company to which he has been elected by the Board of
Directors of the Company (or to which he has otherwise been appointed), (c) from
all offices of any entity that is a subsidiary of, or is otherwise related to or
affiliated with, the Company, (d) from all administrative, fiduciary or other
positions he may hold with respect to arrangements or plans for, of or relating
to the Company, and (e) from any other directorship, office, or position of any
corporation, partnership, joint venture, trust or other enterprise (each, an
"Other Entity")

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insofar as Executive is serving in the directorship, office, or position of the
Other Entity at the request of the Company. The Company hereby consents to and
accepts said resignations.

         2. COMPENSATION AND BENEFITS. Subject to the conditions hereof, the
Company and Executive agree to the following:

                  a. SEVERANCE COMPENSATION. As severance compensation, the
Company shall pay Executive an amount equal to $870,000, which represents three
times Executive's base salary in effect immediately before the Retirement Date.
Such amount shall be paid as follows:

                           (i) $200,000 shall be paid to Executive on the day
                  after which Executive's right of revocation under Paragraph
                  5.c.(iv) of this Agreement expires; and

                           (ii) the remaining $670,000 shall be paid in 36
                  installments as follows: (A) the first installment, in the
                  amount of $18,611.15, shall be paid on the day after the
                  Executive's right of revocation under Paragraph 5.c.(iv) of
                  this Agreement expires; and (B) the remaining 35 installments
                  shall each be in the amount of $18,611.11 and shall be paid on
                  a monthly basis on the last business day of each month
                  commencing on the last business day of November 2000 and
                  ending on the last business day of September 2003.

                  Notwithstanding anything herein to the contrary, any amounts
payable to Executive under this Paragraph 2 shall be reduced by an amount equal
to any remuneration paid to Executive (whether such remuneration is paid
directly to Executive or to another person or entity on Executive's behalf) for
services performed by Executive as an employee of, or consultant or advisor to,
any entity.

                  b. STOCK OPTIONS. Executive has certain stock options that
were granted to Executive prior to the Retirement Date. Except as otherwise
provided in this Paragraph 2.b., Executive's eligibility to exercise such
options is governed and will continue to be governed by the terms and conditions
of the Company's Amended and Restated 1989 Stock Option Plan and the agreements
previously entered into between the Company and Executive with respect to such
stock options. Notwithstanding the foregoing, (i) any stock options that were
granted to Executive as of the Retirement Date that are not vested shall
continue to vest pursuant to the vesting schedule set forth in the agreements
governing such stock options for a period of three years after the Retirement
Date (the "Vesting Date"), and (ii), with respect to any stock options granted
on or after July 21, 1992, Executive shall have until the earlier of (A)
September 24, 2003 or (B) the expiration date of such stock option (as
identified in the agreement evidencing such stock option) to exercise or forfeit
these vested options, and each agreement evidencing any such stock option is
hereby amended accordingly. Executive agrees and acknowledges that he is
ineligible for any other stock options, grants or awards, and that he forfeits
upon the Retirement Date any rights in or to any other stock option grants,
including, without limitation, any right to vest after the Vesting Date in any
stock options that are not already vested as of the Vesting Date.

                  c. MEDICAL COVERAGE. Executive and his eligible dependents
shall be allowed to continue as a plan participant in the Company's group health
plan (medical, dental and vision coverage) (the "Health Plan") for a period of
three years following the Retirement

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Date (the "Benefit Period") on the same basis that the Company's active
employees participate in such plan during that period. Executive agrees that
such continued participation in the Health Plan will satisfy the Health Plan's
obligation to provide Executive the right to continuation coverage under the
Health Plan pursuant to federal law and that, as a result, Executive's (and his
dependents') coverage under the Health Plan will terminate at the end of the
Benefit Period.

                  d. PROFESSIONAL FEES. The Company and Executive acknowledge
and agree that each shall be responsible for the payment of their respective
legal fees and costs (and related disbursements) incurred in connection with
Executive's retirement and resignation and all matters relating to the
negotiation and execution of the releases and all other matters covered by this
Agreement.

                  e. COMPANY BENEFIT PLANS. Except as provided above in
Paragraph 2.c of this Agreement, Executive's post-Retirement Date eligibility
for benefits, if any, as a past employee of the Company under the Company's
retirement and welfare benefit plans shall be as set forth in the respective
plan documents and shall be based on his employment termination on the
Retirement Date, and his entitlement to benefits for the period of his
participation therein shall be determined pursuant to the terms thereof.

                  f. BUSINESS EXPENSES. The Company will reimburse Executive for
any reasonable business expenses incurred by Executive prior to the Retirement
Date that are reimbursable pursuant to the Company's expense reimbursement
policies.

                  g. VACATION PAY. Executive shall be paid for accrued but
unused vacation time determined as of the Retirement Date, with such payment to
be made within thirty days of the Retirement Date.

                  h. ACCRUED SALARY. Executive shall be paid in accordance with
the Company's normal payroll cycle any base salary amount earned but unpaid as
of the Retirement Date.

                  i. DIRECTORS' AND OFFICERS' LIABILITY INSURANCE. The Company
shall maintain, for a period of not less than six years from the Retirement
Date, the Company's current directors' and officers' liability insurance policy
(or a successor policy providing substantially comparable coverage) to the
extent that it provides coverage for events occurring prior to the Retirement
Date.

                  j. WITHHOLDING. The Company shall withhold such amounts from
the payments described herein as are required by applicable tax or other law.

         3.       NON-COMPETITION.

                  a. During the Benefit Period, Executive shall not, directly or
indirectly, do or suffer to be done any of the following: own, manage, control
or participate in the ownership, management, or control of, or be employed or
engaged by or otherwise affiliated or associated as a consultant, independent
contractor or otherwise with any other corporation, partnership, proprietorship,
firm, association, or other business entity, or otherwise engage in any
business, which is in competition with the Company's business; provided,
however, that the ownership of

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not more than one percent of any class of publicly-traded securities of any
entity shall not be deemed a violation of this Agreement. For purposes of this
Agreement, the "Company's business" shall mean any business in which the Company
actively engages now, and any business in which the Company has actively engaged
in the two (2) year period prior to the date hereof, including, without
limitation, the discovery and development of (i) products designed to inhibit
post surgical scarring and adhesions, (ii) a proprietary monoclonal antibody to
treat anti-inflammatory disorders and (iii) small molecule drug candidates to
the modulate cognitive state of the nervous system and to treat symptoms of
schizophrenia.

                  b. In the event Executive shall violate any provision of this
Paragraph 3 as to which there is a specific time period during which he is
prohibited from taking certain actions or from engaging in certain activities as
set forth in such provision, then, in such event, such violation shall toll the
running of such time period from the date of such violation until such violation
shall cease. The foregoing shall in no way limit the Company's rights under
Paragraph 8 of this Agreement.

                  c. Executive has carefully considered the nature and extent of
the restrictions upon him and the rights and remedies conferred upon the Company
under this Paragraph 3 and this Agreement, and hereby acknowledges and agrees
that the same are reasonable in time and territory, are designed to eliminate
competition which otherwise would be unfair to the Company, do not stifle the
inherent skill and experience of Executive, would not operate as a bar to
Executive's sole means of support, are fully required to protect the legitimate
interests of the Company and do not confer a benefit upon the Company
disproportionate to the detriment to Executive. Executive further acknowledges
that his obligations in this Paragraph 3 are made in consideration of, and are
adequately supported by the payments by the Company to Executive described
herein.

         4. NO SOLICITATION OF EMPLOYEES. Executive agrees that he will not:

                  (i) Employ, assist in employing, or otherwise associate in
         business with any person who is, or has been in the 12 month period
         prior to such individual's association with Executive an employee,
         officer or agent of the Company, or any of its affiliated, related or
         subsidiary entities, unless such employee was involuntarily terminated
         by the Company.

                  (ii) Induce any person who is an employee, officer or agent of
         the Company, or any of its affiliated, related, or subsidiary entities
         to terminate such relationship.

         5. RELEASE BY EXECUTIVE.

                  a. Executive for himself and his dependents, successors,
assigns, heirs, executors and administrators (and his and their legal
representatives of every kind), hereby releases, dismisses, remisses and forever
discharges the Company from any and all arbitrations, claims (including claims
for attorney's fees), demands, damages, suits, proceedings, actions and/or
causes of action of any kind and every description, whether known or unknown,
which Executive now has or may have had for, upon, or by reason of any cause
whatsoever (except that this release shall not apply to (x) the obligations of
the Company arising under this Agreement

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and (y) Executive's rights of indemnification by the Company, if any, pursuant
to the Company's certificate of incorporation or by-laws or any agreement
between the Company and Executive), against the Company ("claims"), including
but not limited to:

                  (i) any and all claims, directly or indirectly, arising out of
         or relating to: (A) Executive's past employment or service with the
         Company; and (B) Executive's retirement and resignation as President
         and Chief Executive Officer of the Company and any other position
         described in Paragraph 1 of this Agreement.

                  (ii) any and all claims of discrimination, including but not
         limited to claims of discrimination on the basis of sex, race, age,
         national origin, marital status, religion or disability, including,
         specifically, but without limiting the generality of the foregoing, any
         claims under the Age Discrimination in Employment Act, as amended (the
         "ADEA"), Title VII of the Civil Rights Act of 1964, as amended, the
         Americans with Disabilities Act of 1990, the Family and Medical Leave
         Act of 1993 and Ohio Revised Code Chapter 4112;

                  (iii) any and all claims of wrongful or unjust discharge or
         breach of any contract or promise, express or implied; and

                  (iv) any and all claims under or relating to any and all
         employee compensation, employee benefit, employee severance or employee
         incentive bonus plans and arrangements, all of which Executive agrees
         are forfeited upon his retirement and resignation; provided that he
         shall remain entitled to the amounts and benefits described in
         Paragraph 2 above. Executive agrees that he intends to release any and
         all workers compensation claims he may have against the Company by this
         Agreement, and further agrees to execute any documentation as may be
         reasonably required to perfect such release when presented to him by
         the Company.

                  b. Executive understands and acknowledges that the Company
does not admit any violation of law, liability or invasion of any of his rights
and that any such violation, liability or invasion is expressly denied. The
consideration provided under this Agreement is made for the purpose of settling
and extinguishing all claims and rights (and every other similar or dissimilar
matter) that Executive ever had or now may have or ever will have against the
Company to the extent provided in this Paragraph 5. Executive further agrees and
acknowledges that no representations, promises or inducements have been made by
the Company other than as appear in this Agreement.

                  c.       Executive further understands and acknowledges that:

                  (i) The release provided for in this Paragraph 5, including
         claims under the ADEA to and including the date of this Agreement, is
         in exchange for the additional consideration provided for in this
         Agreement, to which consideration he was not heretofore entitled;

                  (ii) He has been advised by the Company to consult with legal
         counsel prior to executing this Agreement and the release provided for
         in this Paragraph 5, has had an opportunity to consult with and to be
         advised by legal counsel of his choice, fully

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         understands the terms of this Agreement, and enters into this Agreement
         freely, voluntarily and intending to be bound;

                  (iii) He has been given a period of twenty-one days to review
         and consider the terms of this Agreement, and the release contained
         herein, prior to its execution and that he may use as much of the
         twenty-one day period as he desires; and

                  (iv) He may, within seven days after execution, revoke this
         Agreement. Revocation shall be made by delivering a written notice of
         revocation to the Chief Operating Officer at the Company. For such
         revocation to be effective, written notice must be actually received by
         the Chief Operating Officer at the Company no later than the close of
         business on the seventh day after Executive executes this Agreement. If
         Executive does exercise his right to revoke this Agreement, all of the
         terms and conditions of the Agreement shall be of no force and effect
         and the Company shall have no obligation to satisfy the terms or make
         any payment to Executive as set forth in Paragraph 2 of this Agreement.

                  d. Executive will never file a lawsuit or other complaint
asserting any claim that is released in this Paragraph 5.

                  e. Executive and the Company acknowledge that his retirement
and resignation is by mutual agreement between the Company and Executive, and
that Executive waives and releases any claim that he has or may have to
reemployment.

                  f. For purposes of the above provisions of this Paragraph 5,
the "Company" shall include its present and former predecessors, subsidiaries,
divisions, related or affiliated companies, officers, directors, stockholders,
members, employees, heirs, successors, assigns, representatives, agents,
accountants and counsel.

         6. CONFIDENTIAL INFORMATION.

                  a. Executive acknowledges and agrees that in the performance
of his duties as an officer and employee of the Company he was brought into
frequent contact with, had or may have had access to, and/or became informed of
confidential and proprietary information of the Company and/or information which
is a competitive asset of the Company (collectively, "Confidential Information")
and the disclosure of which would be harmful to the interests of the Company or
its subsidiaries. Confidential Information shall include, without limitation:
(a) customer and distributor information such as names, addresses, sales
histories, purchasing habits, credit status, pricing levels, etc., (b) certain
prospective customer and distributor information lists, etc., (c) product and
systems specifications, schematics, designs, concepts for new or improved
products and services and other products and services data, (d) product and
material costs, (e) suppliers' and prospective suppliers' names, addresses and
contracts, (f) future corporate planning data, (g) production methods and
equipment, (h) marketing strategies, (i) the Company's financial results and
business condition, (j) any of the foregoing which belong to any other person or
company but to which Executive has had access by reason of his employment with
the Company, (k) pre-clinical and clinical testing procedures and other related
information, and (l) any other information which constitutes a "trade secret"
under federal or state law. Such

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Confidential Information is more fully described in Subparagraph (b) of this
Paragraph 6. Executive acknowledges that the Confidential Information of the
Company gained by Executive during his association with the Company was
developed by and/or for the Company through substantial expenditure of time,
effort and money and constitutes valuable and unique property of the Company.

                  b. Executive will keep in strict confidence, and will not,
directly or indirectly, at any time, disclose, furnish, disseminate, make
available, use or suffer to be used in any manner any Confidential Information
of the Company without limitation as to when or how Executive may have acquired
such Confidential Information. Executive specifically acknowledges that
Confidential Information includes any and all information, whether reduced to
writing (or in a form from which information can be obtained, translated, or
derived into reasonably usable form), or maintained in the mind or memory of
Executive and whether compiled or created by the Company, which derives
independent economic value from not being readily known to or ascertainable by
proper means by others who can obtain economic value from the disclosure or use
of such information, that reasonable efforts have been put forth by the Company
to maintain the secrecy of confidential or proprietary or trade secret
information, that such information is and will remain the sole property of the
Company, and that any retention or use by Executive of confidential or
proprietary or trade secret information after the termination of Executive's
employment with and services for the Company shall constitute a misappropriation
of the Company's Confidential Information.

                  c. Executive will immediately return to the Company (to the
extent he has not already returned), equipment, software, electronic files,
computers, including any laptop, in good condition, all property of the Company,
including, without limitation, property, documents and/or all other materials
(including copies, reproductions, summaries and/or analyses) which constitute,
refer or relate to Confidential Information of the Company.

                  d. Executive further acknowledges that his obligation of
confidentiality shall survive, regardless of any other breach of this Agreement
or any other agreement, by any party hereto, until and unless such Confidential
Information of the Company shall have become, through no fault of Executive
generally known to the public or Executive is required by law (after providing
the Company with notice and opportunity to contest such requirement) to make
disclosure. Executive's obligations under this Paragraph 6 are in addition to,
and not in limitation or preemption of, all other obligations of confidentiality
which Executive may have to the Company under general legal or equitable
principles or statutes.

         7. DISCLOSURE.

                  a. From the date of this Agreement through the end of the
Benefit Period, Executive will communicate the contents of Paragraphs 3, 4, 6,
8.b., 9 and 11 of this Agreement to any person, firm, association, or
corporation other than the Company which he intends to be employed by,
associated in business with, or represent.

                  b. Executive shall take no action with respect to the
Company's common stock that is in violation of the federal securities laws.

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         8. BREACH.

                  a. If Executive breaches any of the provisions of this
Agreement (and in the case of a breach that is capable of being cured, fails to
cure such breach within fifteen days after written notice by the Company to
Executive specifying the circumstances that constitute such breach), then the
Company may, at its sole option, immediately terminate all remaining payments
and benefits described in this Agreement, including the vesting or
exercisability of any stock options under Paragraph 2.b, and obtain
reimbursement from Executive of all payments and benefits already provided
pursuant to Paragraph 2 of this Agreement, plus any expenses and damages
incurred as a result of the breach (including, without limitation, reasonable
attorneys' fees), with the remainder of this Agreement, and all promises and
covenants herein, remaining in full force and effect.

                  (i) Notwithstanding the foregoing, the Company will not
         terminate pursuant to Paragraph 8.a. above any benefits to which
         Executive is entitled under any tax-qualified retirement plan of the
         Company, and Executive's rights under Part 6 of Subtitle B of Title I
         of the Employee Retirement Income Security Act of 1974 as amended, if
         any, will not be reduced by any action taken by the Company under
         Paragraph 8.a. above.

                  (ii) Executive may challenge any Company action under
         Paragraph 8.a. above.

                  b. Executive acknowledges and agrees that the remedy at law
available to the Company for breach by Executive of any of his obligations under
Paragraphs 3, 4, 6 and 7 of this Agreement would be inadequate and that damages
flowing from such a breach would not readily be susceptible to being measured in
monetary terms. Accordingly, Executive acknowledges, consents and agrees that,
in addition to any other rights or remedies which the Company may have at law,
in equity or under this Agreement, upon adequate proof of Executive's violation
of any provision of Paragraphs 3, 4, 6 or 7 of this Agreement, the Company shall
be entitled to immediate injunctive relief and may obtain a temporary order
restraining any threatened or further breach, without the necessity of proof of
actual damage.

         9. CONTINUED AVAILABILITY AND COOPERATION.

                  a. Executive shall cooperate fully with the Company, the
Company's counsel and the Company's insurer in connection with any present and
future actual or threatened litigation or administrative proceeding involving
the Company that relates to events, occurrences or conduct occurring (or claimed
to have occurred) during the period of Executive's employment by the Company.
This cooperation by Executive shall include, but not be limited to:

                  (i) making himself reasonably available for interviews and
         discussions with the Company's counsel as well as for depositions and
         trial testimony;

                  (ii) if depositions or trial testimony are to occur, making
         himself reasonably available and cooperating in the preparation
         therefor as and to the extent that the Company or the Company's counsel
         reasonably requests;

                  (iii) refraining from impeding in any way the Company's
         prosecution or defense of such litigation or administrative proceeding;
         and

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                  (iv) cooperating fully in the development and presentation of
         the Company's prosecution or defense of such litigation or
         administrative proceeding.

                  b. Executive shall be reimbursed by the Company for reasonable
travel, lodging, telephone and similar expenses incurred in connection with such
cooperation, which the Company shall reasonably endeavor to schedule at times
not conflicting with the reasonable requirements of any employer of Executive,
or with the requirements of any third party with whom Executive has a business
relationship permitted hereunder that provides remuneration to Executive.
Executive shall not unreasonably withhold his availability for such cooperation.

         10. SUCCESSORS AND BINDING AGREEMENT.

                  a. This Agreement shall be binding upon and inure to the
benefit of the Company and any successor of or to the Company, including,
without limitation, any persons acquiring, directly or indirectly, all or
substantially all of the business and/or assets of the Company whether by
purchase, merger, consolidation, reorganization, or otherwise (and such
successor shall thereafter be deemed included in the definition of "the Company"
for purposes of this Agreement), but shall not otherwise be assignable or
delegable by the Company.

                  b. This Agreement shall inure to the benefit of and be
enforceable by Executive's personal or legal representatives, executors,
administrators, successors, heirs, distributees, and/or legatees.

                  c. This Agreement is personal in nature and none of the
parties hereto shall, without the consent of the other parties, assign, transfer
or delegate this Agreement or any rights or obligations hereunder except as
expressly provided in Subparagraphs (a) and (b) of this Paragraph 10.

                  d. This Agreement is intended to be for the exclusive benefit
of the parties hereto, and except as provided in Subparagraphs (a) and (b) of
this Paragraph 10, no third party shall have any rights hereunder.

         11. NON-DISCLOSURE; STATEMENTS TO THIRD PARTIES.

                  a. Except as otherwise provided in Paragraph 7, all provisions
of this Agreement and the circumstances giving rise hereto are and shall remain
confidential and shall not be disclosed to any person not a party hereto (other
than (i) Executive's spouse, if any, (ii) each party's attorney, financial
advisor and/or tax advisor to the extent necessary for such advisor to render
appropriate legal, financial and tax advice, and (iii) persons or entities that
fall within the scope of Paragraphs 3 and 4 of this Agreement, but only to the
extent required thereby), except as necessary to carry out the provisions of
this Agreement, and except as may be required by law. Notwithstanding the
foregoing, this Agreement may be disclosed and described as well as filed with
or provided to the Securities and Exchange Commission or any other governmental
instrumentality or agency, including the Internal Revenue Service, if the
Company deems such filing or provision to be necessary.

                  b. Because the purpose of this Agreement is to settle amicably
any and all potential disputes or claims among the parties, neither Executive
nor the Company shall, directly

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or indirectly, make or cause to be made any statements to any third parties
criticizing or disparaging the other or commenting on the character or business
reputation of the other. Executive further hereby agrees not: (i) to comment to
others concerning the status, plans or prospects of the business of the Company,
or (ii) to engage in any act or omission that would be detrimental, financially
or otherwise, to the Company, or that would subject the Company to public
disrespect, scandal, or ridicule. For purposes of this Subparagraph 11.b., the
"Company" shall mean the Company and its directors, officers, predecessors,
parents, subsidiaries, divisions, and related or affiliated companies, officers,
directors, stockholders, members, employees, heirs, successors, assigns,
representatives, agents, accountants and counsel.

         12. NOTICES. For all purposes of this Agreement, all communications
provided for herein shall be in writing and shall be deemed to have been duly
given when delivered, addressed to the Company (to the attention of the Chief
Executive Officer) at its principal executive offices and to Executive at his
principal residence, 16940 Catsden Road, Chagrin Falls, Ohio 44023, or to such
other address as any party may have furnished to the other in writing and in
accordance herewith. Notices of change of address shall be effective only upon
receipt.

         13. MISCELLANEOUS. No provision of this Agreement may be modified,
waived or discharged unless such modification, waiver or discharge is agreed to
in writing signed by Executive and the Company. No waiver by either party hereto
at any time of any breach by the other party hereto or compliance with any
condition or provision of this Agreement to be performed by such other party
shall be deemed a waiver of similar or dissimilar provisions or conditions at
the same or at any prior or subsequent time. No agreements or representations,
oral or otherwise, expressed or implied with respect to the subject matter
hereof have been made by any of the parties that are not set forth expressly in
this Agreement and every one of them (if, in fact, there have been any) is
hereby terminated without liability or any other legal effect whatsoever.

         14. ENTIRE AGREEMENT. This Agreement shall constitute the entire
agreement among the parties hereto with respect to the subject matter hereof and
shall supersede all prior verbal or written agreements, covenants,
communications, understandings, commitments, representations or warranties,
whether oral or written, by any party hereto or any of its representatives
pertaining to such subject matter.

         15. GOVERNING LAW. Any dispute, controversy, or claim of whatever
nature arising out of or relating to this Agreement or breach thereof shall be
governed by and under the laws of the State of Ohio. The parties agree that any
and all disputes, controversies, or claims of whatever nature arising out of or
relating to this agreement or breach thereof shall be resolved by a court of
general jurisdiction in the State of Ohio, and the parties hereby consent to the
exclusive jurisdiction of such court in any action or proceeding arising under
or brought to challenge, enforce, or interpret any of the terms of this
Agreement.

         16. VALIDITY. The invalidity or unenforceability of any provision of
this Agreement shall not affect the validity or enforceability of any other
provision of this Agreement, which shall nevertheless remain in full force and
effect.

                                       10
<PAGE>   11

         17. 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 shall constitute one and the same Agreement.

         18. CAPTIONS AND PARAGRAPH HEADINGS. Captions and Paragraph headings
used herein are for convenience and are not part of this Agreement and shall not
be used in construing it.

         19. FURTHER ASSURANCES. Each party hereto shall execute such additional
documents, and do such additional things, as may reasonably be requested by the
other party to effectuate the purposes and provisions of this Agreement.

                  IN WITNESS WHEREOF, the parties have executed and delivered
this Agreement as of the date first set forth above.

                                                GLIATECH INC.

                                                By: /s/ Robert P. Pinkas
                                                    ------------------------

                                                Date: October 24, 2000
                                                      ----------------------

Witness: /s/ Cynthia M. Quinn                   /s/ Thomas O. Oesterling
         ---------------------------            ----------------------------
                                                Thomas O. Oesterling, Ph.D.

Date: October 24, 2000                          Date: October 24, 2000
      ------------------------------                  ----------------------

                                       11

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