Document:

Offer Letter between the company and Stephen R. Miller

 Exhibit 10.1 
 [BG Medicine logo and letterhead] 
 June 22, 2011 

Stephen R. Miller 
 18 Stoneybrook Road

 North Grafton, MA 01536 
 Dear
Steve: 
 On behalf of BG Medicine, Inc. (the “Company”), and the entire Board of Directors of the Company, I am
delighted to offer you employment with the Company. Your initial position will be Chief Commercial Officer reporting to the Chief Executive Officer. We anticipate that your employment will start effective June 27, 2011 (the “Start
Date”). 
 This offer letter and the accompanying documents and agreements summarize and set forth important terms about
your employment with the Company. As is generally true for Company employees, you will be employed on an at-will basis, which means that neither you nor the Company is guaranteeing this employment relationship for any specific period of time. Either
of us may choose to end the employment relationship at any time, for any reason, with or without notice. In addition, you should understand that the descriptions of benefits and other compensation arrangements set forth herein are meant to be
summary in form and may be subject to change. If any benefit is subject to a benefit plan, the terms of that plan will control. Other than the terms of this agreement, the Company reserves the right to alter, supplement or rescind its employment
procedures, benefits or policies (other than the employment at-will policy) at any time in its sole and absolute discretion and without notice. 
 1. Compensation. 
 a. Salary. Your initial base pay
will be at a rate of $11,041.67 on a semi-monthly basis ($265,000.00 on an annualized basis), minus customary deductions for federal and state taxes and the like, and in accordance with the Company’s normal payroll practices. 

b. Annual Performance Bonus. You will also be eligible to receive an annual bonus of up to
fifty percent (50%) of your base salary, payable upon the achievement, as determined by the Chief Executive Officer and Board of Directors, of specific milestones to be mutually agreed upon by you and the Chief Executive Officer in writing. The
annual bonus shall be paid to you no later than March 15th of the calendar year immediately following the calendar year in which it was earned. You must be employed by the Company at the time that the annual bonus is paid in order to be eligible for and have
earned the annual bonus. 

  
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 c. Stock Options. Subject to the terms of and contingent upon your
execution of a stock option agreement (the “Option Agreement”) issued pursuant to the Company’s 2010 Employee, Director and Consultant Stock Plan (the “Stock Plan”), and subject to Board approval, you will be granted an
option to purchase 125,000 shares of common stock of the Company at an exercise price equal to the Fair Market Value (as defined in the Stock Plan) of the stock at the time of the grant. The option will vest 25% on the first anniversary of your
Start Date and thereafter the remaining 75% shall vest on a quarterly basis on the last day of each quarter over a period of three years, provided that you remain employed on the vesting day. Additionally, upon the consummation of a Change of
Control (as defined below) during your employment by the Company, 50% of any of your unvested option shares subject to this grant at the time of the Change of Control shall become immediately vested and exercisable upon the Change of Control. The
aforesaid will be subject to the specific terms and conditions of the applicable plan document, which, in the case of inconsistency, shall govern. 
 d. Benefits. You will be eligible to participate in the Company’s benefit plans to the same extent as, and subject to the same terms, conditions and limitations applicable to, other Company
employees of similar rank and tenure. Summaries of each of the Company’s benefit plans are available to you. You will be reimbursed for all reasonable out-of-pocket expenses incurred during the performance of your duties, in accordance with the
Company’s reimbursement policies as established or modified from time to time by the Company. Each calendar year you will be eligible to receive four (4) weeks vacation and up to twelve (12) holidays, as set forth by the Company and
subject to the Company’s vacation and holiday policies as in effect from time to time. 
 2. Severance Pay and Benefits
upon Termination of Employment. 
 a. Termination Other Than for Cause, Death or Disability. Should
the Company terminate your employment for reasons other than for “Cause”, “Disability” (as these terms are defined in the Stock Plan) or death, and conditioned upon your execution and non-revocation of a separation agreement
which contains, among other things, a full and general release of claims to the Company and its affiliates and their respective directors, officers, agents and employees, in a form satisfactory to the Company, and upon your compliance with your
obligations set forth in your Non-Competition, Confidentiality and Intellectual Property Agreement (the “Confidentiality Agreement”), then the Company will provide you with: (i) payments equal to six (6) months of your then
current base salary, payable in installments over six (6) months, and in accordance with the Company’s normal payroll practices; and (ii) if the Company is subject to the Consolidated Omnibus Budget Reconciliation Act
(“COBRA”) or similar state law and if you properly elect to receive benefits under COBRA, six (6) months of your COBRA premiums at the Company’s normal rate of contribution for employees. If you are entitled to the payments and
benefits described in this paragraph (a), then you will not be entitled to the payments and benefit described in paragraph (b) below. 

  
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 b. Termination upon a Change of Control. Should the Company terminate
your employment within twelve (12) months following the consummation of a Change of Control for reasons other than for “Cause”, “Disability” (as these terms are defined in the Stock Plan) or death, and conditioned upon your
execution of a separation agreement which contains, among other things, a full and general release of claims to the Company and its affiliates and their respective directors, officers, agents and employees, in a form satisfactory to the Company, and
upon your compliance with your obligations set forth in the Confidentiality Agreement, then the Company will provide you with: (i) payments equal to six (6) months of your then current base salary, payable in installments over six
(6) months, and in accordance with the Company’s normal payroll practices; and (ii) if the Company is subject to COBRA or similar state law and if you properly elect to receive benefits under COBRA, six (6) months of your COBRA
premiums at the Company’s normal rate of contribution for employees. If you are entitled to the payments and benefits described in this paragraph (b), then you will not be entitled to the payments and benefit described in paragraph
(a) above. 
 c. Any severance payments paid under this Section 2 will commence within 60 days
of your separation from service, provided that, as stated above: (i) you sign and do not revoke a separation agreement (which shall be provided to you within five (5) days following a qualifying separation from employment), and
(ii) you continue to comply with the Confidentiality Agreement. 
 d. Nothing in Section 2 shall
alter your status as an at-will employee. 
 e. For purposes of this offer letter, “Change of
Control” means: 
 (i) Ownership. Any “Person” (as such term is used in Sections 13(d) and 14(d)
of the Exchange Act) becomes the “Beneficial Owner” (as defined in Rule 13d-3 under the Exchange Act), directly or indirectly, of securities of the Company representing 50% or more of the total voting power represented by the
Company’s then outstanding voting securities (excluding for this purpose any such voting securities held by the Company or its Affiliates or by any employee benefit plan of the Company) pursuant to a transaction or a series of related
transactions which the Board of Directors does not approve; or 
 (ii) Merger/Sale of Assets. (A) A merger
or consolidation of the Company whether or not approved by the Board of Directors, other than a merger or consolidation which would result in the voting securities of the Company outstanding immediately prior thereto continuing to represent (either
by remaining outstanding or by being converted into voting securities of the surviving entity or the parent of such corporation) more than 50% of the total voting power represented by the voting securities of the Company or such surviving entity or
parent of such corporation, as the case may be, outstanding immediately after such merger or consolidation; or (B) the sale or disposition by the Company of all or substantially all of the Company’s assets in a transaction requiring
stockholder approval; or 
 (iii) “Change of Control” shall be interpreted, if applicable, in a manner,
and limited to the extent necessary, so that it will not cause adverse tax consequences under Section 409A. 

  
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 3. Certifications by You. By signing this offer letter, you are certifying to the
Company that (i) your employment with the Company does not, and will not, require you to breach any agreement entered into by you prior to employment with the Company (i.e., you have not entered into any agreements with previous employers that
are in conflict with your obligations to the Company); and (ii) to the extent you are subject to restrictive agreements with any prior employer that may affect your employment with the Company, you have provided us with a copy of that
agreement. Please understand that the Company does not want you to disclose any confidential information belonging to a previous employer or to incorporate the proprietary information of any previous employer into the Company’s proprietary
information and expects that you will abide by restrictive covenants to prior employers. 
 4. Required I-9
Documentation. For purposes of completing the INS I-9 form, you must provide us sufficient documentation to demonstrate your eligibility to work in the United States on or before your first day of employment. If you have any questions about what
documentation you must provide, please contact Stacie Rader, SVP, Executive Operations and Human Resources. Your employment with the Company is conditioned on your eligibility to work in the United States. 

5. Confidentiality and Other Obligations by You. As part of your employment with the Company, you have been, and will be, exposed
to, and provided with, valuable confidential and/or trade secret information concerning the Company and its present and prospective clients. As a result, in order to protect the Company’s legitimate business interests, you agree, as a condition
of your employment, to enter into the enclosed Confidentiality Agreement. You must sign and return the Confidentiality Agreement before beginning your employment with the Company. 

6. Compliance with Section 409A and 280G of the Code. 

a. Notwithstanding any other provision of this offer letter to the contrary, if any amount (including imputed
income) to be paid to you pursuant to this offer letter as a result of your termination of employment is “deferred compensation” subject to Section 409A of the Internal Revenue Code of 1986, as amended and any successor statute,
regulation and guidance thereto (“Section 409A of the Code”), and if you are a “Specified Employee” (as defined under Section 409A of the Code) as of the date of your termination of employment hereunder, then, to the extent
necessary to avoid the imposition of excise taxes or other penalties under Section 409A of the Code, the payment of benefits, if any, scheduled to be paid by the Company to you hereunder during the first 6 (six) -month period following the date
of a termination of employment hereunder shall not be paid until the date which is the first business day after six (6) months have elapsed since your termination of employment for any reason other than death. Any deferred compensation payments
delayed in accordance with the terms of this Section 6.a. shall be paid in a lump sum after 6 (six) months have elapsed since your termination of employment. Any other payments will be made according to the schedule provided for herein.

 b. If any of the benefits set forth in this offer letter are “deferred compensation” under
Section 409A of the Code, any termination of employment triggering payment of such benefits must constitute a “separation from service” under Section 409A of the Code before distribution of such benefits can commence. To the
extent that the termination of your 

  
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employment does not constitute a “separation from service” under Section 409A of the Code (as the result of further services that are reasonably anticipated to be provided by you
to the Company at the time your employment terminates), any benefits payable under this offer letter that constitute “deferred compensation” under Section 409A of the Code shall be delayed until after the date of a subsequent event
constituting a “separation from service” under Section 409A of the Code. For purposes of clarification, this Section 6.b. shall not cause any forfeiture of benefits on your part, but shall only act as a delay until such time as a
“separation from service” occurs. 
 c. It is intended that each installment of the payments and
benefits provided under this offer letter shall be treated as a separate “payment” for purposes of Section 409A of the Code. Neither the Company nor you shall have the right to accelerate or defer the delivery of any such payments or
benefits except to the extent specifically permitted or required by Section 409A of the Code. 
 d.
Any reimbursements or direct payment of your expenses subject to Section 409A of the Code shall be for expenses incurred during your lifetime (or during a shorter period of time specified in this offer letter), and shall be made no later
than the end of the calendar year following the calendar year in which such expense is incurred by you. Any reimbursement or right to direct payment of your expense in one calendar year shall not affect the amount that may be reimbursed or paid for
in any other calendar year, and any reimbursement or payment of your expense (or right thereto) may not be exchanged or liquidated for another benefit or payment. 

e. Notwithstanding any other provision of this offer letter to the contrary, the offer letter shall be interpreted
and at all times administered in a manner that avoids the inclusion of compensation in income under Section 409A(a)(1) of the Code. Any provision inconsistent with Section 409A of the Code will be read out of the offer letter. For purposes
of clarification, this Section 6.e. shall be a rule of construction and interpretation and nothing in this Section 6.e. shall cause a forfeiture of benefits on the part of you. 

f. If any payment or benefit you would receive under this offer letter, when combined with any other payment or
benefit you receive pursuant to a Change of Control (for purposes of this section, a “Payment”) would: (i) constitute a “parachute payment” within the meaning of Section 280G the Internal Revenue Code of 1986, as
amended and any successor statute, regulation and guidance thereto (the “Code”); and (ii) but for this sentence, be subject to the excise tax imposed by Section 4999 of the Code (the “Excise Tax”), then such Payment
shall be either: (A) the full amount of such Payment; or (B) such lesser amount (with cash payments being reduced before stock option compensation) as would result in no portion of the Payment being subject to the Excise Tax, whichever of
the foregoing amounts, taking into account the applicable federal, state and local employment taxes, income taxes, and the Excise Tax, results in your receipt, on an after-tax basis, of the greater amount of the Payment notwithstanding that all or
some portion of the Payment may be subject to the Excise Tax. 
 g. The parties intend this offer letter
to be in compliance with Section 409A and Section 280G of the Code. You acknowledge and agree that the Company does not guarantee 

  
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the tax treatment or tax consequences associated with any payment or benefit arising under this offer letter, including but not limited to consequences related to Section 409A or
Section 280G of the Code. 
 7. General. 
 This offer letter, together with the Confidentiality Agreement, the Stock Plan and the Option Agreement and any other agreements specifically referred to herein, embodies the entire agreement and
understanding between the parties hereto with respect to the subject matter hereof and supersedes all prior oral or written agreements and understandings relating to the subject matter hereof. The terms and provisions of this offer letter may be
modified or amended only by written agreement executed by the parties hereto, and may be waived (or consent for the departure there from granted) only by a written document executed by the party entitled to the benefits of such terms or provisions.

 Because our employment discussions and the terms of your employment are confidential, it is understood that you shall not
disclose the fact or terms of such discussions or the terms of your employment with the Company to anyone other than your immediate family and your legal or financial advisor at any time, absent prior written consent from the Company. 

The Company may assign its rights and obligations hereunder to any person or entity that succeeds to all or substantially all of the
Company’s business. You may not assign your rights and obligations hereunder without the prior written consent of the Company and any such attempted assignment by you without the prior written consent of the Company will be void. 

This offer letter and the rights and obligations of the parties hereunder will be construed in accordance with and governed by the law of
the Commonwealth of Massachusetts, without giving effect to the conflict of law principles thereof. By accepting this offer of employment, you agree that any action, demand, claim or counterclaim in connection with any aspect of your employment with
the Company, or any separation of employment (whether voluntary or involuntary) from the Company, shall be brought in the courts of the Commonwealth of Massachusetts or of the United States of America for the District of Massachusetts, and shall be
resolved by a judge alone, and you waive and forever renounce your right to a trial before a civil jury. 
 This offer shall
remain open, unless sooner revoked by the Company, through June 24, 2011. 
 Please acknowledge acceptance of this offer
letter by signing, dating, and indicating your Start Date below. Keep one copy for your files and return one executed copy to Stacie Rader, SVP, Executive Operations and Human Resources. 

  
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 Steve, we look forward to having you on the team. 

 

			
	Very truly yours,
	
	BG Medicine, Inc.
		
	By:	 	 /s/ Pieter Muntendam

	Pieter Muntendam, MD
	President and CEO

 Accepted and Agreed to: 
  

	
	 /s/ Stephen R. Miller

	 Stephen R. Miller

	
	 6/27/2011

	 Start Date

  
 7Severance Agreement

 Exhibit 10.1 
 Severance Agreement 
 THIS SEVERANCE AGREEMENT
(“Agreement”) dated as of April 25, 2011 (the “Effective Date”) is entered by and between David Clarke (“Executive”) and GSI Group Inc., a company organized under the laws of the Province of New
Brunswick, Canada (the “Company”). 
 RECITALS 

WHEREAS, Executive is currently employed by the Company on an at-will basis; and 

WHEREAS, the Company and Executive desire to maintain the continued services of Executive as an at-will employee of the Company on and
after the Effective Date; and 
 WHEREAS, the Company desires to encourage the continued attention and dedication of Executive
to his duties of employment without personal distraction or conflict of interest in circumstances which could arise from the occurrence of a Group Sale (as defined below). 
 AGREEMENT 
 NOW, THEREFORE, in exchange for good and valuable
consideration, the receipt and sufficiency of which is hereby acknowledged, the Company and Executive agree as follows: 
 1.
Certain Defined Terms. In addition to terms defined elsewhere herein, the following terms have the following meanings when used in this Agreement with initial capital letters: 

(a) “Annual Base Salary” shall mean the rate of Executive’s annual base salary as in effect from time to time.

 (b) “Board” shall mean the Board of Directors of the Company. 

(c) The Company shall have “Cause” to terminate Executive’s employment hereunder upon: (i) Executive’s
willful failure to substantially perform his duties to the Company and/or any of its subsidiaries (other than any such failure resulting from Executive’s Disability or any inability to engage in any substantial gainful activity that could
reasonably be expected to result in Disability) which is not remedied within 30 days after receipt of written notice from the Company specifying such failure; (ii) Executive’s willful failure to carry out, or comply with, in any material
respect any lawful and reasonable directive of the Board or the Chief Executive Officer of the Company, which is not remedied within 30 days after receipt of written notice from the Company specifying such failure; (iii) Executive’s
commission at any time of any act or omission that results in, or may reasonably be expected to result in, a conviction, plea of no contest, plea of nolo contendere, or imposition of unadjudicated probation

 
for any felony or crime involving moral turpitude; or (iv) Executive’s unlawful use (including being under the influence) or possession of illegal drugs on the Company’s premises
or while performing Executive’s duties and responsibilities for the Company and/or any of its subsidiaries. Whether or not an event giving rise to “Cause” occurs will be determined by the Board in its sole discretion. 

(d) “Code” shall mean Internal Revenue Code of 1986, as amended. 

(e) “Date of Termination” shall mean the actual date of Executive’s termination of employment. 

(f) “Disability” shall mean Executive’s inability to engage in any substantial gainful activity by reason of any
medically determinable physical or mental impairment that can be expected to result in death or that can be expected to last for a continuous period of not less than twelve (12) months. 

(g) “Group Sale” shall mean the consummation by the Company (whether directly involving the Company or indirectly
involving the Company through one or more intermediaries), in any single transaction or series of related transactions, of a sale or other disposition of assets of the Company which, as of the date of such sale or other disposition, produce or
otherwise result in seventy percent (70%) or more of the aggregate revenue of the Laser Products Group to any “person” or related “group” of “persons” (as such terms are used in Sections 13(d) and 14(d)(2) of the
Securities Exchange Act of 1934, as amended (the “Exchange Act”)). Whether or not a single transaction or a series of related transactions constitutes a “Group Sale” will be determined by the Board in its sole discretion.

 (h) “Laser Products Group” shall mean the business group of the Company which includes the Synrad,
Continuum, Quantronix, JK Laser, Control Laser and Baublys businesses and products and the associated distribution entities or portions thereof. 
 (i) “Option Period” shall mean the period beginning on the day immediately following the sixth-month anniversary of a Group Sale and ending on the seven-month anniversary of a Group Sale.

 (j) “Post-Sale Period” shall mean the period beginning on the date of a Group Sale and ending on the
six-month anniversary of a Group Sale. 
 (k) “Section 409A” shall mean Section 409A of the Code and the
Department of Treasury Regulations and other interpretive guidance issued thereunder, including, without limitation, any such regulations or other guidance that may be issued after the Effective Date. 

2. Term of Agreement. The term of this Agreement shall be for the period beginning on the Effective Date and ending on the earlier
of (a) the date on which Executive is no longer employed in the position of Group Executive in charge of the Laser Products Group, and (b) the end of the Option Period following the first Group Sale occurring after the Effective Date;
provided that the expiration or termination of the term shall not impair the rights or obligations of any party hereto which shall have accrued prior to such expiration or termination. 

 3. Post-Sale Period Employment. 

(a) To the extent Executive is employed as of the date of a Group Sale, Executive shall, during the Post-Sale Period (subject to any
termination of employment by the Company prior to the end of the Post-Sale Period), serve as an employee of the Company with responsibilities, duties and authority as may be from time to time assigned to Executive by the Board or the Chief Executive
Officer of the Company. Such duties, responsibilities and authority may include services for one or more subsidiaries or affiliates of the Company (or, as directed by the Board, any third party, including, without limitation, any person or group of
related persons that were involved in the Group Sale). Executive (a) shall devote substantially all of his working time and efforts to the business and affairs of the Company and its subsidiaries (or, as directed by the Board, any third party,
including, without limitation, any person or group of related persons that were involved in the Group Sale) and (b) agrees to observe and comply with the Company’s rules and policies as adopted by the Company from time to time. 

(b) To the extent Executive is employed during the Post-Sale Period and the Option Period, Executive shall, during the Post-Sale Period
and the Option Period, (i) receive an Annual Base Salary equal to his Annual Base Salary in effect as of immediately prior to such Group Sale and (ii) continue to be eligible to receive an annual performance-based cash bonus with a target
bonus opportunity equal to his target bonus opportunity in the year in which such Group Sale occurred. 
 4. Acceleration of
Equity Upon a Group Sale. Notwithstanding any provision to the contrary in any equity award agreement, effective immediately prior to the occurrence of a Group Sale (and subject to the consummation of such Group Sale and Executive’s
continued employment through the occurrence of such Group Sale), all equity awards granted by the Company and then held by Executive shall become fully vested and exercisable with respect to all shares subject thereto. 

5. Severance Payments. 
 (a) If (i) during the Post-Sale Period, Executive’s employment is terminated by the Company without Cause or (ii) during the Option Period, Executive’s employment is terminated by the
Company or Executive for any reason, the Company shall, subject to Executive’s execution and non-revocation of a waiver and release of claims agreement in the Company’s customary form (a “Release”) in accordance with
Section 18(c), pay to Executive, over twelve months in accordance with the Company’s then-applicable payroll practices, a cash payment in an amount equal to the sum of (A) 100% of Executive’s Annual Base Salary as of
immediately prior to the Date of Termination and (B) 100% of Executive’s target annual bonus opportunity for the year in which the Date of Termination occurs. 
 (b) Notwithstanding any other provision of this Agreement, no payment shall be made pursuant to this Section 5 following the date Executive first violates any restrictive covenants agreed to
in writing by and between the Company and Executive if Executive does not cure such violation within 30 days of written notice thereof. 

 (c) The provisions of this Section 5 shall supersede in their entirety any
severance payment provisions in any severance plan, policy, program or other arrangement maintained by the Company. 
 6.
Inventions Assignment/Non-Compete Agreement. As a condition precedent to the parties entering into this Agreement, Executive shall have executed and delivered to the Company an Employee Patent and Proprietary Information Utilization,
Non-Competition and Non-Solicitation Agreement (or similar agreement) in the Company’s then-applicable form. 
 7.
Parachute Payments. Notwithstanding any other provision of this Agreement, to the extent Executive would be subject to the excise tax under Section 4999 of the Code on the payment made under Section 5 hereof and any other
payments or benefits Executive would receive from the Company required to be included in the calculation of parachute payments for purposes of Sections 280G and 4999 of the Code, the amount payable under this Agreement shall be automatically reduced
to an amount one dollar less than that, when combined with such other amounts and benefits required to be so included, would subject Executive to the excise tax under Section 4999 of the Code. 

8. Assignment and Successors. The Company may (a) assign its rights and obligations under this Agreement to any entity,
including, without limitation, any person or group of related persons that were involved in a Group Sale or any successor to all or substantially all the assets of the Company, by merger or otherwise, and (b) may assign or encumber this
Agreement and its rights hereunder as security for indebtedness of the Company and its Affiliates; provided that no assignment pursuant to this Section 8 shall relieve the Company of any of the obligations under
Section 5 to the extent such obligations are not satisfied by the assignee. Executive may not assign Executive’s rights or obligations under this Agreement to any individual or entity. This Agreement shall be binding upon and inure
to the benefit of the Company, Executive and their respective successors, assigns, personnel and legal representatives, executors, administrators, heirs, distributees, devisees, and legatees, as applicable. 

9. Notices. Any notice, request, claim, demand, document and other communication hereunder to any party hereto shall be
effective upon receipt (or refusal of receipt) and shall be in writing and delivered personally or sent by telex, telecopy, or certified or registered mail, postage prepaid, to the following address (or at any other address as any party hereto shall
have specified by notice in writing to the other party hereto): 
  

	 	(a)	If to the Company: 

 GSI Group
Inc. 
 125 Middlesex Turnpike 
 Bedford, MA 01730-1409 
 Attn: Vice President, Corporate Resources 

Fax Number: (781) 266-5115 

 and a copy to: 
 Latham & Watkins LLP 
 885 Third Avenue 

New York, New York 10022-4802 
 Attn:  James C. Gorton 

          Bradd L. Williamson 

Fax Number: (212) 751-4864 
  

	 	(b)	If to Executive, at the address set forth on the signature page hereto. 

 10. Governing Law. This Agreement shall be governed, construed, interpreted and enforced in accordance with the substantive laws of the Commonwealth of Massachusetts, without giving effect to any
principles of conflicts of law, whether of the Commonwealth of Massachusetts or any other jurisdiction, and where applicable, the laws of the United States, that would result in the application of the laws of any other jurisdiction. 

11. Dispute Resolution. 
 (a) With respect to disputes and claims hereunder, each of the parties irrevocably submits to the exclusive jurisdiction of any court of competent jurisdiction sitting in Middlesex Country, Massachusetts,
for the purposes of any suit, action or other proceeding arising out of this Agreement, any related agreement or any transaction contemplated hereby or thereby. Each of the parties hereto further agrees that service of any process, summons, notice
or document by U.S. registered mail to such party’s respective address set forth or described in Section 9 shall be effective service of process for any action, suit or proceeding in any court of competent jurisdiction sitting in
Middlesex Country, Massachusetts with respect to any matters to which it has submitted to jurisdiction in this Section 11. Each of the parties hereto irrevocably and unconditionally waives any objection to the laying of venue of any
action, suit or proceeding arising out of this Agreement, any related document or the transactions contemplated hereby and thereby in any court of competent jurisdiction sitting in Middlesex County, Massachusetts, and hereby and thereby further
irrevocably and unconditionally waives and agrees not to plead or claim in any such court that any such action, suit or proceeding brought in any such court has been brought in an inconvenient forum. 

(b) As a specifically bargained for inducement for each of the parties hereto to enter into this Agreement (after having the opportunity
to consult with counsel), each party hereto expressly waives the right to trial by jury in any lawsuit or proceeding relating to or arising in any way from this Agreement or the matters contemplated hereby. 

12. Entire Agreement. The terms of this Agreement (together with any other agreements and instruments contemplated hereby or
referred to herein) are intended by the parties hereto to be the final expression of their agreement with respect to the subject matter described herein (including, without limitation, any obligation of the Company or its subsidiaries to make
severance payments or provide severance benefits to Executive) and may not be contradicted by evidence of any prior or contemporaneous agreement. The parties hereto further intend that this Agreement shall constitute the complete and exclusive
statement of its terms and that no extrinsic evidence whatsoever may be introduced in any judicial, administrative, or other legal proceeding to vary the terms of this Agreement. Nothing in this Agreement shall confer upon Executive any right to
continue in the employ or service of the Company or any subsidiary 

 
thereof or shall interfere with or restrict in any way the rights of the Company and its subsidiaries, which rights are hereby expressly reserved, to discharge or terminate the services of
Executive at any time for any reason whatsoever, with or without cause. 
 13. Amendments; Waivers. This Agreement may
not be modified, amended, or terminated except by an instrument in writing, signed by Executive and a duly authorized officer of the Company and approved by the Board, which expressly identifies the amended provision of this Agreement. By an
instrument in writing similarly executed and approved by the Board, Executive or a duly authorized officer of the Company may waive compliance by the other party or parties hereto with any provision of this Agreement that such other party was or is
obligated to comply with or perform; provided, however, that such waiver shall not operate as a waiver of, or estoppel with respect to, any other or subsequent failure to comply or perform. No failure to exercise and no delay in
exercising any right, remedy, or power hereunder shall preclude any other or further exercise of any other right, remedy, or power provided herein or by law or in equity. 
 14. No Inconsistent Actions. The parties hereto shall not voluntarily undertake or fail to undertake any action or course of action inconsistent with the provisions or essential intent of this
Agreement. Furthermore, it is the intent of the parties hereto to act in a fair and reasonable manner with respect to the interpretation and application of the provisions of this Agreement. 

15. Enforcement. If any provision of this Agreement is held to be illegal, invalid or unenforceable under present or future laws
effective during the term of this Agreement, such provision shall be fully severable; this Agreement shall be construed and enforced as if such illegal, invalid or unenforceable provision had never comprised a portion of this Agreement; and the
remaining provisions of this Agreement shall remain in full force and effect and shall not be affected by the illegal, invalid or unenforceable provision or by its severance from this Agreement. Furthermore, in lieu of such illegal, invalid or
unenforceable provision there shall be added automatically as part of this Agreement a provision as similar in terms to such illegal, invalid or unenforceable provision as may be possible and be legal, valid and enforceable. 

16. Withholding. The Company shall be entitled to withhold from any amounts payable under this Agreement, any federal, state,
local or foreign withholding or other taxes or charges which the Company is required to withhold. The Company shall be entitled to rely on an opinion of counsel if any questions as to the amount or requirement of withholding shall arise. 

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 will constitute one and the same agreement. 
 18. Section 409A. 

(a) General. The parties hereto acknowledge and agree that, to the extent applicable, this Agreement shall be interpreted in
accordance with, and incorporate the terms and conditions required by, Section 409A. Notwithstanding any provision of this Agreement to the contrary, in the event that the Company determines that any amounts payable hereunder will be
immediately taxable to Executive under Section 409A, the Company reserves the right (without any obligation to do so or to indemnify Executive for failure to do so) to (i) adopt such

 
amendments to this Agreement and appropriate policies and procedures, including amendments and policies with retroactive effect, that the Company determines to be necessary or appropriate to
preserve the intended tax treatment of the benefits provided by this Agreement, to preserve the economic benefits of this Agreement and to avoid less favorable accounting or tax consequences for the Company and/or (ii) take such other actions
as the Company determines to be necessary or appropriate to exempt the amounts payable hereunder from Section 409A or to comply with the requirements of Section 409A and thereby avoid the application of penalty taxes thereunder. No
provision of this Agreement shall be interpreted or construed to transfer any liability for failure to comply with the requirements of Section 409A from Executive or any other individual to the Company or any of its Affiliates, employees or
agents. 
 (b) Separation from Service under Section 409A. Notwithstanding any provision to the contrary in this
Agreement: (i) no amount shall be payable pursuant to Section 5 in connection with Executive’s termination of employment with the Company unless the termination of Executive’s employment constitutes a “separation from
service” within the meaning of Section 1.409A-1(h) of the Department of Treasury Regulations; and (ii) for purposes of Section 409A, Executive’s right to receive any installment payments shall be treated as a right to
receive a series of separate and distinct payments. Notwithstanding any provision to the contrary in this Agreement, if Executive is deemed at the time of his separation from service to be a “specified employee” for purposes of
Section 409A(a)(2)(B)(i) of the Code, to the extent delayed commencement of any portion of the termination benefits to which Executive is entitled under this Agreement is required in order to avoid a prohibited distribution under
Section 409A(a)(2)(B)(i) of the Code, such portion of Executive’s termination benefits shall not be provided to Executive prior to the earlier of (A) the expiration of the six-month period measured from the date of Executive’s
“separation from service” with the Company (as such term is defined in the Treasury Regulations issued under Section 409A of the Code) or (B) the date of Executive’s death; upon the earlier of such dates, all payments
deferred pursuant to this sentence shall be paid in a lump sum to Executive, and any remaining payments due under the Agreement shall be paid as otherwise provided herein. 

(c) Release. Notwithstanding anything to the contrary in this Agreement, to the extent that any payments of
“nonqualified deferred compensation” (within the meaning of Section 409A) due under this Agreement as a result of Executive’s termination of employment are subject to Executive’s execution and delivery of a Release,
(i) the Company shall deliver the Release to Executive within seven (7) days following the Date of Termination, and (ii) if Executive fails to execute the Release on or prior to the Release Expiration Date (as defined below) or timely
revokes his acceptance of the Release thereafter, Executive shall not be entitled to any payments or benefits otherwise conditioned on the Release. For purposes of this Section 18(c), “Release Expiration Date” shall mean
the date that is twenty-one (21) days following the date upon which the Company timely delivers the Release to Executive, or, in the event that Executive’s termination of employment is “in connection with an exit incentive or other
employment termination program” (as such phrase is defined in the Age Discrimination in Employment Act of 1967), the date that is forty-five (45) days following such delivery date. To the extent that any payments of nonqualified deferred
compensation (within the meaning of Section 409A) due under this Agreement as a result of Executive’s termination of employment are delayed pursuant to this Section 18(c), such amounts shall be paid in a lump sum on the first
payroll date to occur on or after the 90th day following
the date of Executive’s termination of employment, provided that Executive executes and does not revoke the Release prior to such 90th day (and any applicable revocation period has expired). 

[signature page follows] 

 IN WITNESS WHEREOF, the parties have caused this Agreement to be duly executed and delivered
as of the date first above written. 
  

					
	GSI GROUP INC.	 	
		
	By:	 	  

		
	Title:	 	  

		
	DAVID CLARKE	 	
	
	  

		
	Residence Address:	 	
	  
	 	
	  
	 	

 Signature Page for Severance Agreement for David Clarke

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