Document:

(..continued)

                                             -4-

Mr. John N. Hatsopoulos
3 Woodcock Lane
Lincoln, MA  01733

Dear John:

        This letter (the "Agreement") confirms our agreement regarding
termination of your consulting services with Thermo Electron Corporation (the
"Company"). This Agreement shall be effective as of February 21, 2000 (the
"Effective Date"). This Agreement replaces and supersedes any and all prior
agreements between you and the Company regarding the engagement of you for your
services by the Company, whether written or oral, formal or informal, including
without limitation that certain letter agreement by and between you and the
Company dated September 15, 1998 relating to your retirement and engagement as a
consultant (the "Consulting Agreement"), which such Consulting Agreement shall
be, as of the Effective Date terminated and of no further force or effect.

        In exchange for the mutual covenants set forth in this Agreement,
including without limitation, your execution of the General Release of all
Claims attached and incorporated herein as Exhibit 1, the Company agrees to the
following:

        1. Termination of Consulting Agreement. By mutual agreement the
Consulting Agreement will terminate as of the Effective Date. As of that date
you shall have no further obligation or right to render any services to the
Company of any kind, including but not limited to consulting services,
investment management services or any other type of services.

        2.     Lump Sum Payment and Stock Options.

        (a)    As of the Effective Date, the Company shall deem the amount of
               compensation owed to you from the Effective Date through December
               31, 2003 under the Consulting Agreement as fully earned and
               payable to you in a single lump sum payment of $1,958,333.40
               (minus any applicable federal, state and local taxes and other
               withholdings) as soon as reasonably practicable following the
               Effective Date.

        (b)    If an option is (i) Vested (i.e., the underlying shares are not
               subject to repurchase by the Company or its subsidiaries, as
               applicable) and (ii) in the money, it shall be exercisable from
               the Effective Date until May 21, 2000 or February 21, 2002, as
               indicated on Exhibit 2 (attached and incorporated herein).

        (c)    Notwithstanding the terms of any stock option plan or agreement
               pursuant to which such options were granted and regardless of the
               fact that you are no longer a director of the Company or any of
               its subsidiaries, the following terms and conditions shall apply
               to the stock options previously granted to you that are, as of
               the Effective Date, either not Vested (i.e., the underlying
               shares are subject to repurchase rights by the Company or its
               subsidiaries, as applicable) or not "in the money:"

           (i) The resale restrictions and the Company's or it subsidiaries'
        repurchase rights with respect to such options shall continue to ratably
        lapse in accordance with their original terms through the earlier of (A)
        the original expiration date of such option or (B) December 31, 2003;
        provided that, the Company shall waive the resale restrictions to the
        extent necessary to allow you to realize sufficient proceeds from such
        sale to pay state and federal income taxes resulting from such sale and
        from exercise of the option by which the stock was acquired.

           (ii) Any option that is, under its original terms, exercisable on
        December 31, 2003 shall thereafter remain exercisable until April 1,
        2004.

           (iii) Any option or portion of an option that is, under its original
        terms, scheduled to Vest after December 31, 2003 is hereby forfeited,
        unless there occurs on or before that date a change of control (as
        defined by the terms of the original option) that would have accelerated
        the Vesting under its original terms, in which event the option shall be
        exercisable on or before April 1, 2004 to the extent its Vesting has
        been so accelerated.

        The options described in this subparagraph (c) are identified on Exhibit
3 (attached and incorporated herein).

        3. Resignation from the Board. Effective as of the Effective Date, you
hereby resign as a member of the Company's Board of Directors, and the Boards of
Directors of its subsidiaries, as the case may be.

        4. Health Insurance. At its cost, the Company will continue to provide,
or use its best efforts to obtain for you, through December 31, 2003, group
health and dental insurance coverage for you and your eligible dependents
substantially the same as group health and dental coverage currently provided to
you by the Company. If the provision of such insurance coverage provides taxable
income to you, the Company will pay you such additional amount as will, net of
tax on such amount, equal taxes on the taxable income so created.

        5. Return of Company Property; Support Services and Reimbursement. On or
about March 5, 2000, you will return to the Company any and all documents,
materials and information related to the Company, or its subsidiaries,
affiliates or businesses, and all other property of the Company, including,
without limitation, Company credit cards and files. The Company shall, until
December 31, 2003, continue to provide you with (i) an office situated in an
office building that is located in a suburb west of Boston with occupancy rates
similar to your current office space; (ii) communications and office equipment
and services similar to those it now provides to you; provided that, your
personal computer will not be linked to any Thermo Electron computer network;
(iii) fully operational Bloomberg terminal and service; (iv) full-time services
of your present secretary or, if she is unable or unwilling to continue as such,
the Company shall use its best efforts to secure for you a full-time secretary
of substantially similar experience; (v) the newspapers and periodicals that you
now receive; and (vi) a non-accountable allowance for your travel and other
expenses of $100,000 per year payable $25,000 quarterly in arrears (prorated for
any fraction of a quarter).

        6. Taxes. All payments by the Company under this Agreement will be
reduced by all taxes and other amounts that the Company is required to withhold
under applicable law and all other deductions authorized by you.

        7. Restriction on Purchase or Sale of Common Stock. You understand that
you will continue to be a "Reporting Person" for purposes of Section 16 of the
Securities Exchange Act of 1934 and the rules and regulations promulgated
thereunder for a period of six months following the Effective Date and that you
are required to preclear transactions in the Company and its subsidiaries'
securities with the Company's Stock Transaction Coordinator, Ms. Pauline I.
Northern. You are also reminded that you will remain subject to insider trading
regulations under federal securities law. You are urged to contact the Corporate
Secretary of the Company, Ms. Sandra L. Lambert, should you have any questions
regarding compliance with the insider trading regulations under the federal
securities laws.

        8. Confidentiality of this Agreement. You agree that all information
relating in any way to the subject matter of this Agreement, including the terms
of this Agreement, shall be held confidential by you and shall not be publicized
or disclosed by you to any person (other than an immediate family member, legal
counsel or financial advisor, provided that any such individual to whom
disclosure is made agrees to be bound by these confidentiality obligations),
business entity or government agency, except as mandated by state or federal
law.

        9. Company Information and Invention Agreement. You agree to abide by
and comply with the terms of the Thermo Electron Corporation Information and
Invention Agreement executed by you, a copy of which is attached and
incorporated herein as Exhibit 4.

        10. Non-Disparagement. You agree that you will be supportive in your
public statements about the Company and its subsidiaries and affiliates and that
you will not disparage the Company or its subsidiaries or affiliates, or any of
the people or organizations connected with them, or do or say anything that
could disrupt the good morale of the employees of the Company or otherwise harm
the reputation of the Company and its subsidiaries and affiliates and any of the
organizations or people connected with them. The Company agrees that it will
cause the officers of the Company and its subsidiaries not to disparage you or
otherwise do or say anything that harms your reputation and that the Company
shall be solely responsible for any breach of the provisions contained in this
Section 10 by any such officers. Should any party violate the requirements of
this provision, any non-breaching party shall be relieved of the requirements of
this provision to the extent necessary to respond to statements made by the
breaching party. Nothing in this provision shall prevent the parties from (i)
complying with compulsory legal process or otherwise making disclosures in
connection with litigation or administrative proceedings, (ii) making such
disclosures as are necessary to obtain legal advice, (iii) making disclosures as
are required by federal, state or local regulatory authorities, and (iv) making
disclosures which by law are required or cannot be prohibited.

        11. Company's Relief on Breach. You agree that your knowing and material
breach of the terms of this Agreement, including but not limited to a knowing
and material breach of either Paragraph 8, 9 or 10, shall, notwithstanding
anything contained herein to the contrary, (i) cause all Vested options listed
on Exhibits 2 and 3 hereof to terminate and be immediately canceled 90 days
after the date the Company notifies you of the breach and you will have no
further rights with respect to such options if you do not exercise such options
within such 90 day period, (ii) cause all options which are not Vested listed on
Exhibit 3 to be canceled and forfeited as of such date and (iii) immediately
terminate the Company's obligations set forth in the last sentence of Paragraph
5. It is understood that the foregoing relief will be in addition to any other
legal or equitable remedy available to the Company, including without limitation
the right to specific performance and injunctive relief.

        12. Indemnification Agreement. Notwithstanding anything contained herein
to the contrary, the Thermo Electron Corporation Amended and Restated
Indemnification Agreement, effective as of October 13, 1999 (the
"Indemnification Agreement"), by and between the Company and you and attached
and incorporated herein as Exhibit 5 shall remain in full force and effect, and
in accordance with its terms.

        13. Cooperation. You agree to reasonably cooperate with the Company with
respect to all matters arising during or related to your past employment or
consulting engagement, including but not limited to cooperation in connection
with any governmental investigation, litigation or regulatory or other
proceeding which may have arisen or which may arise following the signing of
this Agreement, subject to applicable privileges.

        14. Choice of Law. This Agreement and the rights and obligations of the
parties hereunder shall be construed in accordance with and governed by the laws
of the Commonwealth of Massachusetts, without giving effect to the conflict of
law principles thereof.

        15. Entire Agreement. This Agreement contains the entire agreement
between you and the Company and replaces all prior and contemporaneous
agreements, communications and understandings, whether written or oral, with
respect to your relationship with the Company, including but not limited to the
Consulting Agreement.

        16. Severability. If one or more provisions of this Agreement are held
to be unenforceable under applicable law, such provision shall be excluded from
this Agreement and replaced with a provision which is enforceable and comes
closest to the intent of the parties underlying the unenforceable provision.

        17. Successors and Assigns. No party hereto may assign any of its rights
under this Agreement without the prior written consent of the other party. This
Agreement is binding on each of the parties' permitted assigns, successors in
interest, heirs, administrators and executors.

        18. Voluntary Agreement. In signing this Agreement, you give the Company
assurance that you have signed it voluntarily and with a full understanding of
its terms and that you have sufficient opportunity to consider this Agreement
and to consult with anyone of your choosing before signing it. If the terms of
this Agreement are acceptable to you, please sign and return it to the
undersigned. Upon the execution of this Agreement, it will take effect as a
legally-binding agreement between you and the Company on the basis set forth
above, as of the Effective Date.

        19. Document Under Seal. This Agreement is intended to be signed as an
instrument under seal as of the Effective Date.

                                            THERMO ELECTRON CORPORATION

                                            -----------------------------------
                                            By:  Richard Syron
                                            Title:  CEO and President

Accepted and Agreed to:

--------------------------------
John N. Hatsopoulos4

                              EMPLOYMENT AGREEMENT

        This Employment Agreement (the "Agreement"), dated as of January 10,
2000, is entered into between Thermo Electron Corporation, a Delaware
corporation with its principal place of business at 81 Wyman Street, Waltham,
Massachusetts 02454 (the "Company"), and Paul F. Kelleher, residing at 61 Davis
Road, Carlisle, Massachusetts 01741 (the "Employee").

        The Company desires to retain the services of the Employee through March
31, 2004, and the Employee desires to be employed by the Company on the terms
set forth herein. In consideration of the mutual covenants and promises
contained herein, and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged by the parties hereto, the parties
agree as follows:

        1. Term of Employment. The Company hereby agrees to employ the Employee,
and the Employee hereby accepts employment with the Company, upon the terms set
forth in this Agreement, for the period commencing on the date hereof, and
continuing until the earlier of March 31, 2004 or termination in accordance with
the provisions of Section 4 (such period, the "Employment Period").

        2. Capacity. The Employee shall provide services to the Company relating
primarily to finance and accounting. The Employee shall be based at the
Company's headquarters in Waltham, Massachusetts or at such place or places as
may be reasonably designated by the Company's Chief Financial Officer or such
officer or officers of the Company designated by the Chief Financial Officer.
The Employee shall be subject to the supervision of, and shall have such
authority as is reasonably delegated to him by, the Chief Financial Officer or
his designee. Further, subject to the fiduciary duties of the Company's Board of
Directors and the fiduciary duties of the board of directors of ThermoLase
Corporation ("ThermoLase"), the Company shall use its best efforts to cause the
Employee to be a director of ThermoLase during the Employment Period while
ThermoLase is a public company. The Employee will not be entitled to receive any
cash or other compensation for his services as a director of ThermoLase so long
as he is employed by the Company.

        The Employee hereby accepts such employment and agrees to undertake the
duties and responsibilities inherent in such position and such other duties and
responsibilities as the Chief Financial Officer or his designee shall from time
to time reasonably assign to him. Further, commencing April 1, 2000 through the
end of the Employment Period, the Employee's employment status will be reduced
from full-time to part-time. In his capacity as a part-time employee, the
Employee will be available to devote, on average, approximately twenty hours per
week to fulfilling such duties and responsibilities. The Employee agrees to
abide by the rules, regulations, instructions, personnel practices and policies
of the Company and any changes therein that may be adopted from time to time by
the Company.

        3.     Compensation and Benefits.

3.1 Base Salary. The Company shall pay to the Employee, at such times as the
Company pays its employees in general, a base salary at the following annualized
rates:

                 a.    From January 1, 2000 through March 31, 2000
                 (subject to any applicable year-end salary increase):$205,000
                 b.   From April 1, 2000 through March 31, 2004:$125,000

3.2 Bonuses. The Employee will be eligible to receive a bonus for the period
from January 1, 1999 through December 31, 1999 in accordance with the past
practices of the Company, payable at such time as such bonuses are normally
paid. In addition, the Employee shall be eligible to receive a discretionary
bonus for the period from January 1, 2000 through March 31, 2000. The amount of
such bonuses will, as always, be subject to the discretion of the Board of
Directors of the Company. The Employee will not be eligible for any bonus for
the period from April 1, 2000 through the end of the Employment Period.

               3.3 Fringe Benefits. The Employee shall be entitled to
participate in all benefit programs that the Company establishes and makes
available to its employees to the extent that the Employee's position, tenure,
salary, age, part-time status, health and other qualifications make him eligible
to participate. Further, from April 1, 2004 through July 31, 2007, the Company
shall continue to provide at its expense family medical and dental benefits to
the Employee on terms substantially equivalent to the medical and dental
benefits provided to him as of the last day of the Employment Period; provided,
however, the Company's obligation to provide such benefits during such time
period shall cease in the event of the Employee's death.
               3.4 Reimbursement of Expenses. The Company shall reimburse the
Employee for all reasonable travel, entertainment and other expenses incurred or
paid by the Employee in connection with, or related to, the performance of his
duties, responsibilities or services under this Agreement, upon presentation by
the Employee of documentation, expense statements, vouchers and/or such other
supporting information as the Company may request; provided, however, that the
amount available for such travel, entertainment and other expenses may
reasonably be fixed in advance by the Chief Financial Officer.

        4. Employment Termination. The employment of the Employee by the Company
pursuant to this Agreement shall terminate upon the occurrence of any of the
following:

               4.1 At the election of the Company without Cause (as defined
below), at any time, immediately upon written notice to the Employee;

               4.2 At the election of the Company, for Cause, immediately upon
written notice by the Company to the Employee. For the purposes of this Section
4, "Cause" for termination shall mean the Employee's (a) conviction of a felony,
or a misdemeanor involving material fraud or material dishonesty, (b) material
fraud or material dishonesty in the course of his employment with the Company,
(c) misconduct that is materially injurious to the Company or its subsidiaries
and affiliates, (d) gross neglect of his duties and responsibilities under the
terms of this Agreement (other than as a result of disability) and (e)
insubordination;

4.3            Upon the death of the Employee;

4.4 At the election of the Employee, upon not less than 30 days prior written
notice of termination.

        5.     Effect of Termination.

               5.1 Termination by the Company or at the Election of the
Employee. In the event the Employee's employment is terminated by the Company
pursuant to Section 4.1 or Section 4.2 or at the election of the Employee
pursuant to Section 4.4, the Company shall pay to the Employee the compensation
and benefits which would otherwise be payable to him through the last day of his
actual employment by the Company; provided, however, that if the Employee's
employment is terminated by the Company pursuant to Section 4.1, the Company
shall pay to the Employee a severance payment in an amount equal to the balance
of the base salary amounts otherwise payable to the Employee for the period from
the date of termination to March 31, 2004 as set forth in Section 3.1 above,
will continue to provide benefits to the Employee, on a substantially equivalent
basis to the benefits otherwise payable to him under Section 3.3, through March
31, 2004, and from April 1, 2004 through July 31, 2007, will continue to provide
such medical and dental benefits payable to him during such time period under
Section 3.3.

               5.2 Termination for Death. If the Employee's employment is
terminated by death pursuant to Section 4.3, the Company shall pay to the estate
of the Employee a lump sum in an amount equal to the balance of the base salary
amounts otherwise payable to the Employee for the period from the date of
termination to March 31, 2004 as set forth in Section 3.1 and will continue to
provide at its expense through March 31, 2004, family medical and dental
benefits on terms substantially equivalent to the medical and dental benefits
provided to him immediately prior to his death.

               5.3. Survival. Notwithstanding anything herein to the contrary,
Sections 8 through 17 of this Agreement shall survive the termination of this
Agreement.

        6.     Options and Restricted Stock.

               6.1 Upon the later of December 15, 1999 and the date of this
Agreement, all stock options in the Company and any of its subsidiaries that are
"underwater" as of such date (i.e., the exercise price of such option is greater
than the closing price of the common stock underlying such option on such date)
shall become fully vested and immediately exercisable on such date and all of
the Company's and its subsidiaries' repurchase rights with respect thereto shall
lapse; provided, however, that such options shall otherwise remain subject to
all of the terms and conditions thereof. Further, during the Employment Period,
the Employee shall be entitled to retain his stock options in the Company and
any of its subsidiaries, subject to the terms and conditions of such options.
Upon the termination of the Employment Period, or upon the earlier termination
of this Agreement other than pursuant to Section 4.1, such stock options will no
longer vest and no further lapsing of the Company's and its subsidiaries'
repurchase rights will occur. In the event that this Agreement is terminated
pursuant to Section 4.1, then such stock options will continue to vest and the
Company's and its subsidiaries' repurchase rights will continue to lapse until
March 31, 2004. In either such case, the Employee will then have until the
earlier of (i) 90 days or two years after such termination, depending on the
term of the option as specified by the Company's Stock Option Manager or (ii)
the expiration of the exercise period, to exercise the Employee's vested
options. If the Employee does not exercise his vested options by the applicable
deadline, such options will be cancelled, and the Employee will have no further
rights with respect to such options.

               6.2 Upon the later of December 15, 1999 and the date of this
Agreement, all stock of the Company granted to the Employee subject to
restrictions shall become fully vested on such date and all of the Company's
repurchase rights with respect thereto shall lapse.

        7. Retirement. Except as specifically set forth in this Agreement, the
Employee hereby resigns effective as of March 31, 2000 any and all of his
positions as an officer of the Company and as an officer, director and employee
of all of the Company's subsidiaries and affiliates other than his position as a
director of ThermoLase. The Employee further agrees that on March 31, 2004, the
Employee will retire, effective as of such date, as an employee of the Company
and, unless ThermoLase is then a public company, resign as a director of
ThermoLase.

               8. Cooperation. The Employee agrees to reasonably cooperate with
the Company with respect to all matters arising during or related to his
employment, including but not limited to cooperation in connection with any
governmental investigation, litigation or regulatory or other proceeding which
may have arisen or which may arise following the signing of this Agreement.

        9. Amendment to Executive Retention Agreement. You and the Company agree
that, effective April 1, 2000, that certain Executive Retention Agreement
between you and the Company is hereby amended by deleting Sections 3.2 and 4.2
thereof in their entirety. Except as amended hereby, however, such agreement
shall remain in full force and effect.

               10. Waiver of Jury Trial. Each of the parties hereby expressly,
knowingly and voluntarily waives all benefit and advantage of any right to a
trial by jury, and each agrees that he or it will not at any time insist upon,
or plead or in any manner whatsoever claim or take the benefit or advantage of,
a trial by jury in any action arising in connection with this Agreement.

        11. Restriction on Purchase or Sale of Common Stock. The Employee
understands that he will continue to be a "Reporting Person" for purposes of
Section 16 of the Securities Exchange Act of 1934 (the "Exchange Act"), and the
rules and regulations promulgated thereunder, for the period ending the earlier
of (i) the date that the shares of ThermoLase are no longer registered under
Section 12 of the Exchange Act and (ii) six months following his termination as
a director of ThermoLase, and that during that period he is required to preclear
transactions in the Company and its affiliates' securities with the Company's
Stock Transaction Coordinator, Ms. Pauline I. Northern. The Employee is also
urged to contact the Corporate Secretary of the Company, Ms. Sandra L. Lambert,
should he have any questions regarding compliance with the insider trading
regulations under the federal securities laws.

        12. Notices. All notices required or permitted under this Agreement
shall be in writing and shall be deemed effective upon personal delivery or upon
deposit in the United States Post Office, by registered or certified mail,
postage prepaid, addressed to the other party at the address shown above, or at
such other address or addresses as either party shall designate to the other in
accordance with this Section 12.

        13. Entire Agreement. This Agreement constitutes the entire agreement
between the parties and supersedes all prior agreements and understandings,
whether written or oral, relating to the subject matter of this Agreement.

        14. Amendment. This Agreement may be amended or modified only by a
written instrument executed by all of the parties hereto.

        15. Governing Law. This Agreement and all issues relating to this
Agreement and the transactions contemplated hereby shall be governed by,
enforced under and construed in accordance with the laws of the Commonwealth of
Massachusetts without giving effect to any choice or conflict of law provision
or rule that would cause the application of laws of any jurisdiction other than
those of the Commonwealth of Massachusetts.

        16. Successors and Assigns. This Agreement shall be binding upon and
inure to the benefit of all of the parties hereto and their respective
successors and assigns, including any corporation with which, or into which, the
Company may be merged or which may succeed to its respective assets or business;
provided, however, that the obligations of the Employee are personal and shall
not be assigned by him.

        17.    Miscellaneous.

               17.1 No delay or omission by the Company in exercising any right
under this Agreement shall operate as a waiver of that or any other right. A
waiver or consent given by the Company on any one occasion shall be effective
only in that instance and shall not be construed as a bar or waiver of any right
on any other occasion.

               17.2 The captions of the sections of this Agreement are for
convenience of reference only and in no way define, limit or affect the scope or
substance of any section of this Agreement.

<PAGE>

               17.3 In case any provision of this Agreement shall be invalid,
illegal or otherwise unenforceable, the validity, legality and enforceability of
the remaining provisions shall in no way be affected or impaired thereby.

        IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the day and year set forth above.

                                            THERMO ELECTRON CORPORATION

                                            By: ________________________________
Name:
                                            Name:  Anne Pol
                                            Title:     Senior Vice President

                                    EMPLOYEE

                                            -----------------------------------
                                            Paul F. Kelleher

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