EX-10.9



 EXHIBIT 10.9 

AVROBIO, INC. 

EMPLOYMENT AGREEMENT 

This Employment Agreement (“Agreement”) is made as of the 8th day of June,
2018, between AVROBIO, Inc., a Delaware corporation (the “Company”), and Geoff MacKay (the “Executive”) and is effective as of the closing of the Company’s first underwritten public offering of its equity securities pursuant
to an effective registration statement under the Securities Act of 1933, as amended (the “Effective Date”). 
 WHEREAS, the
Company and the Executive are parties to an existing employment agreement, dated December 22, 2016 (the “Prior Agreement”); and 

WHEREAS, the parties intend to replace the Prior Agreement with this Agreement, effective as of the Effective Date. 

NOW, THEREFORE, in consideration of the mutual covenants and agreements herein contained and other good and valuable consideration, the
receipt and sufficiency of which is hereby acknowledged, the parties agree to restate the Prior Agreement as follows: 
 1.
Employment. 
 (a) Term. The term of this Agreement shall commence on the Effective Date and continue until terminated in
accordance with the provisions hereof (the “Term”). The Executive’s employment with the Company will continue to be “at will,” meaning that the Executive’s employment may be terminated by the Company or the Executive at
any time and for any reason subject to the terms of this Agreement. 
 (b) Position and Duties. During the Term, the Executive shall
serve as the Chief Executive Officer of the Company, and shall have supervision and control over and responsibility for the day-to-day business and affairs of the
Company and shall have such other powers and duties as may from time to time be prescribed by the Board of Directors of the Company (the “Board”). The Executive shall devote his full working time and efforts to the business and affairs of
the Company. Notwithstanding the foregoing, the Executive may serve on other boards of directors, with the approval of the Board, or engage in religious, charitable or other community activities as long as such services and activities are disclosed
to the Board and do not materially interfere with the Executive’s performance of his duties to the Company as provided in this Agreement. For the avoidance of doubt, the Executive may continue to serve in the roles set forth on Schedule 1
hereto without the necessity of further approval from the Board, provided that no conflicts result in the future from the Executive’s service in such role. 







 2. Compensation and Related Matters. 

(a) Base Salary. During the Term, the Executive’s annual base salary shall be $500,000. The Executive’s base salary shall be
reviewed annually by the Board or the Compensation Committee of the Board (the “Compensation Committee”). The base salary in effect at any given time is referred to herein as “Base Salary.” The Base Salary shall be payable in a
manner that is consistent with the Company’s usual payroll practices for executive officers. 
 (b) Incentive Compensation.
During the Term, the Executive shall be eligible to receive cash incentive compensation as determined by the Board or the Compensation Committee from time to time. The Executive’s initial target annual incentive compensation shall be
fifty percent of his Base Salary (as in effect at any time, the “Target Annual Incentive Compensation”). Except as otherwise provided herein, to earn incentive compensation, the Executive must be employed by the Company on the day such
incentive compensation is paid. 
 (c) Expenses. The Executive shall be entitled to receive prompt reimbursement for all reasonable
expenses incurred by him during the Term in performing services hereunder, in accordance with the policies and procedures then in effect and established by the Company for its senior officers. 

(d) Other Benefits. During the Term, the Executive shall be eligible to participate in or receive benefits under the Company’s
employee benefit plans in effect from time to time, subject to the terms of such plans. Additionally, during the Term, the Executive shall be eligible to receive such benefits and perquisites as those made available to the other employees of the
Company generally. 
 (e) Vacations. During the Term, the Executive shall be entitled to paid vacation in accordance with the
Company’s policies and procedures, which shall be a minimum of 20 days in addition to the Company’s paid holidays. The Executive shall also be entitled to all paid holidays given by the Company to its executive officers. 

3. Termination. During the Term, the Executive’s employment hereunder may be terminated without any breach of this Agreement under
the following circumstances: 
 (a) Death. The Executive’s employment hereunder shall terminate upon his death. 

(b) Disability. The Company may terminate the Executive’s employment if he is disabled and unable to perform the essential
functions of the Executive’s then existing position or positions under this Agreement with or without reasonable accommodation for a period of 180 days (which need not be consecutive) in any 12-month
period. If any question shall arise as to whether during any period the Executive is disabled so as to be unable to perform the essential functions of the Executive’s then existing position or positions with or without reasonable accommodation,
the Executive may, and at the request of the Company shall, submit to the Company a certification in reasonable detail by a physician selected by the Company to whom the Executive or the Executive’s guardian has no reasonable objection as to
whether the Executive is so disabled or how long such disability is expected to continue, and such certification shall for the purposes of this Agreement be conclusive of the issue. The Executive shall cooperate with any reasonable request of the
physician in connection with such 

  
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certification. If such question shall arise and the Executive shall fail to submit such certification, the Company’s determination of such issue shall be binding on the Executive. Nothing in
this Section 3(b) shall be construed to waive the Executive’s rights, if any, under existing law including, without limitation, the Family and Medical Leave Act of 1993, 29 U.S.C. §2601 et seq. and the Americans with
Disabilities Act, 42 U.S.C. §12101 et seq. 
 (c) Termination by Company for Cause. The Company may terminate the
Executive’s employment hereunder for Cause. For purposes of this Agreement, “Cause” shall mean: (i) conduct by the Executive constituting a material act of misconduct in connection with the performance of his duties, including,
without limitation, misappropriation of funds or property of the Company or any of its subsidiaries or affiliates other than the occasional, customary and de minimis use of Company property for personal purposes; (ii) the commission by the
Executive of any felony or a misdemeanor involving moral turpitude, material deceit or dishonesty, or fraud, or any conduct by the Executive that would reasonably be expected to result in material injury or reputational harm to the Company or any of
its subsidiaries or affiliates if he were retained in his position; (iii) continued non-performance by the Executive of his duties hereunder (other than by reason of the Executive’s physical or
mental illness, incapacity or disability) which has continued for more than 30 days following written notice (with a reasonably detailed summary of such alleged non-performance specified) of such non-performance from the Board (or a committee duly established by the Board to address such matters); (iv) a breach by the Executive of any of the provisions incorporated into or contained in Section 7 of this
Agreement; (v) a material violation by the Executive of the Company’s written employment policies; or (vi) failure to cooperate with a bona fide internal investigation or an investigation by regulatory or law enforcement authorities,
after being instructed by the Company to cooperate, or the willful destruction or failure to preserve documents or other materials known to be relevant to such investigation or the inducement of others to fail to cooperate or to produce documents or
other materials in connection with such investigation. 
 (d) Termination Without Cause. The Company may terminate the
Executive’s employment hereunder at any time without Cause. Any termination by the Company of the Executive’s employment under this Agreement which does not constitute a termination for Cause under Section 3(c) and does not result
from the death or disability of the Executive under Section 3(a) or (b) shall be deemed a termination without Cause. 
 (e)
Termination by the Executive. The Executive may terminate his employment hereunder at any time for any reason, including but not limited to Good Reason. For purposes of this Agreement, “Good Reason” shall mean that the Executive has
complied with the “Good Reason Process” (hereinafter defined) following the occurrence of any of the following events: (i) a material diminution in the Executive’s responsibilities, authority or duties; (ii) a material
diminution in the Executive’s Base Salary except for across-the-board salary reductions based on the Company’s financial performance similarly affecting all or
substantially all senior management employees of the Company; (iii) a material change in the geographic location at which the Executive provides services to the Company; or (iv) a material breach of this Agreement by the Company.
“Good Reason Process” shall mean that (i) the Executive reasonably determines in good faith that a “Good Reason” condition has occurred; (ii) the Executive notifies the Company in writing of the first occurrence of the
Good Reason condition within 60 days of the first occurrence of such condition; (iii) the Executive cooperates 

  
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in good faith with the Company’s efforts, for a period not less than 30 days following such notice (the “Cure Period”), to remedy the condition; (iv) notwithstanding such
efforts, the Good Reason condition continues to exist; and (v) the Executive terminates his employment within 60 days after the end of the Cure Period. If the Company cures the Good Reason condition during the Cure Period, Good Reason shall be
deemed not to have occurred. 
 (f) Notice of Termination. Except for termination as specified in Section 3(a), any termination
of the Executive’s employment by the Company or any such termination by the Executive shall be communicated by written Notice of Termination to the other party hereto. For purposes of this Agreement, a “Notice of Termination” shall
mean a notice which shall indicate the specific termination provision in this Agreement relied upon. 
 (g) Date of Termination.
“Date of Termination” shall mean: (i) if the Executive’s employment is terminated by his death, the date of his death; (ii) if the Executive’s employment is terminated on account of disability under Section 3(b) or
by the Company for Cause under Section 3(c), the date on which Notice of Termination is given; (iii) if the Executive’s employment is terminated by the Company under Section 3(d), the date on which a Notice of Termination is
given; (iv) if the Executive’s employment is terminated by the Executive under Section 3(e) without Good Reason, 30 days after the date on which a Notice of Termination is given, and (v) if the Executive’s employment is
terminated by the Executive under Section 3(e) with Good Reason, the date on which a Notice of Termination is given after the end of the Cure Period. Notwithstanding the foregoing, in the event that the Executive gives a Notice of Termination
to the Company, the Company may unilaterally accelerate the Date of Termination and such acceleration shall not result in a termination by the Company for purposes of this Agreement. 

4. Compensation Upon Termination. 

(a) Termination Generally. If the Executive’s employment with the Company is terminated for any reason, the Company shall pay or
provide to the Executive (or to his authorized representative or estate) (i) any Base Salary earned through the Date of Termination, unpaid expense reimbursements (subject to, and in accordance with, Section 2(c) of this Agreement) and
unused vacation that accrued through the Date of Termination on or before the time required by law but in no event more than 30 days after the Executive’s Date of Termination; and (ii) any vested benefits the Executive may have under any
employee benefit plan of the Company through the Date of Termination, which vested benefits shall be paid and/or provided in accordance with the terms of such employee benefit plans (collectively, the “Accrued Benefit”). 

(b) Termination by the Company Without Cause or by the Executive with Good Reason. During the Term, if the Executive’s employment
is terminated by the Company without Cause as provided in Section 3(d), or the Executive terminates his employment for Good Reason as provided in Section 3(e), then the Company shall pay the Executive his Accrued Benefit. In addition,
subject to the Executive signing a separation agreement containing, among other provisions, a general release of claims in favor of the Company and related persons and entities, confidentiality, return of property and
non-disparagement, in a form and manner satisfactory to the Company (the “Separation Agreement and Release”) and the Separation 

  
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Agreement and Release becoming irrevocable and fully effective and, if applicable, the Executive resigning as a member of the Board of Directors, all within 60 days after the Date of Termination
(or such shorter time period provided in the Separation Agreement and Release): 
 (i) the Company shall pay the Executive an
amount equal to one times the sum of the Executive’s Base Salary (the “Severance Amount”). Notwithstanding the foregoing, if the Executive breaches any of the provisions incorporated into or contained in Section 7 of this
Agreement, all payments of the Severance Amount shall immediately cease; 
 (ii) notwithstanding anything to the contrary in
any applicable option agreement or stock-based award agreement, all time-based stock options and other time-based stock-based awards held by the Executive in which such stock option or other stock-based award would have vested if the Executive had
remained employed for an additional twelve months following the Date of Termination shall vest and become exercisable or nonforfeitable as of the Date of Termination; 

(iii) if the Executive was participating in the Company’s group health plan immediately prior to the Date of Termination
and elects COBRA health continuation, then the Company shall pay to the Executive a monthly cash payment for twelve months or the Executive’s COBRA health continuation period, whichever ends earlier, in an amount equal to the monthly employer
contribution that the Company would have made to provide health insurance to the Executive if the Executive had remained employed by the Company; and 

(iv) the amounts payable under Section 4(b)(i) and (iii) shall be paid out in substantially equal installments in
accordance with the Company’s payroll practice over twelve months commencing within 60 days after the Date of Termination; provided, however, that if the 60-day period begins in one calendar
year and ends in a second calendar year, the Severance Amount shall begin to be paid in the second calendar year by the last day of such 60-day period; provided, further, that the initial payment shall include
a catch-up payment to cover amounts retroactive to the day immediately following the Date of Termination. Each payment pursuant to this Agreement is intended to constitute a separate payment for purposes of
Treasury Regulation Section 1.409A-2(b)(2). 
 5. Change in Control Payment. The
provisions of this Section 5 set forth certain terms of an agreement reached between the Executive and the Company regarding the Executive’s rights and obligations upon the occurrence of a Change in Control of the Company. In the event of
a Change in Control during the Term, all time-based stock options and other time-based stock-based awards held by the Executive as of the Effective Date that were granted to the Executive at least 12 months prior to the Effective Date shall
immediately accelerate and become fully exercisable or nonforfeitable as of immediately prior to such Change in Control. These provisions are intended to assure and encourage in advance the Executive’s continued attention and dedication to his
assigned duties and his objectivity during the pendency and after the occurrence of any such event. These provisions shall apply in lieu of, and expressly supersede, the provisions of Section 4(b) regarding severance pay and benefits upon a
termination of 

  
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employment, if such termination of employment occurs within three months prior to or 18 months after the occurrence of the first event constituting a Change in Control. These provisions shall
terminate and be of no further force or effect beginning 18 months after the occurrence of a Change in Control. 
 (a) Change in
Control. During the Term, if within three months prior to or 18 months after a Change in Control, the Executive’s employment is terminated by the Company without Cause as provided in Section 3(d) or the Executive terminates his
employment for Good Reason as provided in Section 3(e), then, subject to the signing of the Separation Agreement and Release by the Executive and the Separation Agreement and Release becoming irrevocable and fully effective and, if applicable,
the Executive resigning as a member of the Board of Directors, all within 60 days after the Date of Termination (or such shorter time period provided in the Separation Agreement and Release): 

(i) the Company shall pay the Executive a lump sum in cash in an amount equal to 1.5 times the sum of (A) the
Executive’s current Base Salary (or the Executive’s Base Salary in effect immediately prior to the Change in Control, if higher) and (B) the Executive’s Target Annual Incentive Compensation then in effect; 

(ii) notwithstanding anything to the contrary in any applicable option agreement or stock-based award agreement, all time-based
stock options and other time-based stock-based awards held by the Executive shall immediately accelerate and become fully exercisable or nonforfeitable as of the Date of Termination; 

(iii) if the Executive was participating in the Company’s group health plan immediately prior to the Date of Termination
and elects COBRA health continuation, then the Company shall pay to the Executive a monthly cash payment for 18 months or the Executive’s COBRA health continuation period, whichever ends earlier, in an amount equal to the monthly employer
contribution that the Company would have made to provide health insurance to the Executive if the Executive had remained employed by the Company; and 

(iv) The amounts payable under Section 5(a)(i) and (iii) shall be paid or commence to be paid within 60 days after
the Date of Termination; provided, however, that if the 60-day period begins in one calendar year and ends in a second calendar year, such payment shall be paid or commence to be paid in the second calendar
year by the last day of such 60-day period. 
 (b) Additional Limitation. 

(i) Anything in this Agreement to the contrary notwithstanding, in the event that the amount of any compensation, payment or
distribution by the Company to or for the benefit of the Executive, whether paid or payable or distributed or distributable pursuant to the terms of this Agreement or otherwise, calculated in a manner consistent with Section 280G of the
Internal Revenue Code of 1986, as amended (the “Code”) and the applicable regulations thereunder (the “Aggregate Payments”), would be subject to the excise tax imposed by Section 4999 of the Code, then the Aggregate Payments
shall 

  
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be reduced (but not below zero) so that the sum of all of the Aggregate Payments shall be $1.00 less than the amount at which the Executive becomes subject to the excise tax imposed by
Section 4999 of the Code; provided that such reduction shall only occur if it would result in the Executive receiving a higher After Tax Amount (as defined below) than the Executive would receive if the Aggregate Payments were not subject to
such reduction. In such event, the Aggregate Payments shall be reduced in the following order, in each case, in reverse chronological order beginning with the Aggregate Payments that are to be paid the furthest in time from consummation of the
transaction that is subject to Section 280G of the Code: (1) cash payments not subject to Section 409A of the Code; (2) cash payments subject to Section 409A of the Code; (3) equity-based payments and acceleration; and (4) non-cash forms of benefits; provided that in the case of all the foregoing Aggregate Payments all amounts or payments that are not subject to calculation under Treas. Reg.
§1.280G-1, Q&A-24(b) or (c) shall be reduced before any amounts that are subject to calculation under Treas. Reg.
§1.280G-1, Q&A-24(b) or (c). 
 (ii)
For purposes of this Section 5(b), the “After Tax Amount” means the amount of the Aggregate Payments less all federal, state, and local income, excise and employment taxes imposed on the Executive as a result of the Executive’s
receipt of the Aggregate Payments. For purposes of determining the After Tax Amount, the Executive shall be deemed to pay federal income taxes at the highest marginal rate of federal income taxation applicable to individuals for the calendar year in
which the determination is to be made, and state and local income taxes at the highest marginal rates of individual taxation in each applicable state and locality, net of the maximum reduction in federal income taxes which could be obtained from
deduction of such state and local taxes. 
 (iii) The determination as to whether a reduction in the Aggregate Payments shall
be made pursuant to Section 5(b)(i) shall be made by a nationally recognized accounting firm selected by the Company (the “Accounting Firm”), which shall provide detailed supporting calculations both to the Company and the Executive
within 15 business days of the Date of Termination, if applicable, or at such earlier time as is reasonably requested by the Company or the Executive. Any determination by the Accounting Firm shall be binding upon the Company and the Executive. 

(c) Definitions. For purposes of this Section 5, the following terms shall have the following meanings: 

“Change in Control” shall mean any of the following: 

(i) any “person,” as such term is used in Sections 13(d) and 14(d) of the Securities Exchange Act of 1934, as amended
(the “Act”) (other than the Company, any of its subsidiaries, or any trustee, fiduciary or other person or entity holding securities under any employee benefit plan or trust of the Company or any of its subsidiaries), together with all
“affiliates” and “associates” (as such terms are defined in Rule 12b-2 under the Act) of such person, shall become the “beneficial owner” (as such term is defined in Rule 13d-3 under the Act), directly or indirectly, of securities of the Company representing 50 percent or more of the combined voting power of the Company’s then outstanding securities having the right to vote
in an election of the Board (“Voting Securities”) (in such case other than as a result of an acquisition of securities directly from the Company); or 

  
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 (ii) the date a majority of the members of the Board is replaced during any 12-month period by directors whose appointment or election is not endorsed by a majority of the members of the Board before the date of the appointment or election; or 

(iii) the consummation of (A) any consolidation or merger of the Company where the stockholders of the Company,
immediately prior to the consolidation or merger, would not, immediately after the consolidation or merger, beneficially own (as such term is defined in Rule 13d-3 under the Act), directly or indirectly,
shares representing in the aggregate more than 50 percent of the voting shares of the Company issuing cash or securities in the consolidation or merger (or of its ultimate parent corporation, if any), or (B) any sale or other transfer (in
one transaction or a series of transactions contemplated or arranged by any party as a single plan) of all or substantially all of the assets of the Company. 

Notwithstanding the foregoing, a “Change in Control” shall not be deemed to have occurred for purposes of the foregoing clause
(i) solely as the result of an acquisition of securities by the Company which, by reducing the number of shares of Voting Securities outstanding, increases the proportionate number of Voting Securities beneficially owned by any person to
50 percent or more of the combined voting power of all of the then outstanding Voting Securities; provided, however, that if any person referred to in this sentence shall thereafter become the beneficial owner of any additional shares of Voting
Securities (other than pursuant to a stock split, stock dividend, or similar transaction or as a result of an acquisition of securities directly from the Company) and immediately thereafter beneficially owns 50 percent or more of the combined
voting power of all of the then outstanding Voting Securities, then a “Change in Control” shall be deemed to have occurred for purposes of the foregoing clause (i). 

6. Section 409A. 

(a) Anything in this Agreement to the contrary notwithstanding, if at the time of the Executive’s separation from service within the
meaning of Section 409A of the Code, the Company determines that the Executive is a “specified employee” within the meaning of Section 409A(a)(2)(B)(i) of the Code, then to the extent any payment or benefit that the Executive
becomes entitled to under this Agreement on account of the Executive’s separation from service would be considered deferred compensation otherwise subject to the 20 percent additional tax imposed pursuant to Section 409A(a) of the
Code as a result of the application of Section 409A(a)(2)(B)(i) of the Code, such payment shall not be payable and such benefit shall not be provided until the date that is the earlier of (A) six months and one day after the
Executive’s separation from service, or (B) the Executive’s death. If any such delayed cash payment is otherwise payable on an installment basis, the first payment shall include a catch-up
payment covering amounts that would otherwise have been paid during the six-month period but for the application of this provision, and the balance of the installments shall be payable in accordance with their
original schedule. 

  
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 (b) All in-kind benefits provided and expenses eligible
for reimbursement under this Agreement shall be provided by the Company or incurred by the Executive during the time periods set forth in this Agreement. All reimbursements shall be paid as soon as administratively practicable, but in no event shall
any reimbursement be paid after the last day of the taxable year following the taxable year in which the expense was incurred. The amount of in-kind benefits provided or reimbursable expenses incurred in one
taxable year shall not affect the in-kind benefits to be provided or the expenses eligible for reimbursement in any other taxable year (except for any lifetime or other aggregate limitation applicable to
medical expenses). Such right to reimbursement or in-kind benefits is not subject to liquidation or exchange for another benefit. 

(c) To the extent that any payment or benefit described in this Agreement constitutes
“non-qualified deferred compensation” under Section 409A of the Code, and to the extent that such payment or benefit is payable upon the Executive’s termination of employment, then such
payments or benefits shall be payable only upon the Executive’s “separation from service.” The determination of whether and when a separation from service has occurred shall be made in accordance with the presumptions set forth in
Treasury Regulation Section 1.409A-1(h). 
 (d) The parties intend that this Agreement will be
administered in accordance with Section 409A of the Code. To the extent that any provision of this Agreement is ambiguous as to its compliance with Section 409A of the Code, the provision shall be read in such a manner so that all payments
hereunder comply with Section 409A of the Code. Each payment pursuant to this Agreement is intended to constitute a separate payment for purposes of Treasury Regulation Section 1.409A-2(b)(2). The
parties agree that this Agreement may be amended, as reasonably requested by either party, and as may be necessary to fully comply with Section 409A of the Code and all related rules and regulations in order to preserve the payments and
benefits provided hereunder without additional cost to either party. 
 (e) The Company makes no representation or warranty and shall have no
liability to the Executive or any other person if any provisions of this Agreement are determined to constitute deferred compensation subject to Section 409A of the Code but do not satisfy an exemption from, or the conditions of, such Section.

 7. Confidential Information, Noncompetition and Cooperation. 

(a) The terms of the Confidentiality and IP Assignment Agreement (the “Restrictive Covenant Agreement”), between the Company and the
Executive, attached hereto as Exhibit A, shall continue to be in full force and effect and are incorporated by reference in this Agreement. The Executive hereby reaffirms the terms of the Restrictive Covenant Agreement as material terms of
this Agreement. 
 (b) Third-Party Agreements and Rights. The Executive hereby confirms that the Executive is not bound by the terms
of any agreement with any previous employer or other party which restricts in any way the Executive’s use or disclosure of information or the Executive’s engagement in any business. The Executive represents to the Company that the
Executive’s execution of this Agreement, the Executive’s employment with the Company and 

  
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the performance of the Executive’s proposed duties for the Company will not violate any obligations the Executive may have to any such previous employer or other party. In the
Executive’s work for the Company, the Executive will not disclose or make use of any information in violation of any agreements with or rights of any such previous employer or other party, and the Executive will not bring to the premises of the
Company any copies or other tangible embodiments of non-public information belonging to or obtained from any such previous employment or other party. 

(c) Litigation and Regulatory Cooperation. During and after the Executive’s employment, the Executive shall reasonably cooperate
with the Company in the defense or prosecution of any claims or actions now in existence or which may be brought in the future against or on behalf of the Company which relate to events or occurrences that transpired while the Executive was employed
by the Company. The Executive’s full cooperation in connection with such claims or actions shall include, but not be limited to, being available to meet with counsel to prepare for discovery or trial and to act as a witness on behalf of the
Company at mutually convenient times, taking into consideration Executive’s then current business and personal commitments. During and after the Executive’s employment, the Executive also shall cooperate fully with the Company in
connection with any investigation or review of any federal, state or local regulatory authority as any such investigation or review relates to events or occurrences that transpired while the Executive was employed by the Company. The Company shall
reimburse the Executive for any reasonable out-of-pocket expenses incurred in connection with the Executive’s performance of obligations pursuant to this
Section 7(c). 
 (d) Relief. The Executive agrees that it would be difficult to measure any damages caused to the Company which
might result from any breach by the Executive of the promises incorporated into or set forth in this Section 7, and that in any event money damages would be an inadequate remedy for any such breach. Accordingly, subject to Section 8 of
this Agreement, the Executive agrees that if the Executive breaches, or proposes to breach, any portion of this Agreement, the Company shall be entitled, in addition to all other remedies that it may have, to an injunction or other appropriate
equitable relief to restrain any such breach without showing or proving any actual damage to the Company. In addition, in the event the Executive breaches this Section 7 or the provisions incorporated herein during a period when he is receiving
severance payments pursuant to Section 4 or Section 5 hereof, the Company shall have the right to suspend or terminate such severance payments. Such suspension or termination shall not limit the Company’s other options with respect to
relief for such breach and shall not relieve the Executive of his duties under this Agreement. 
 (e) Protected Disclosures and Other
Protected Action. Nothing contained in this Agreement limits the Executive’s ability to communicate with any federal, state or local governmental agency or commission, including to provide documents or other information, without notice to
the Company. 
 8. Arbitration of Disputes. Any controversy or claim arising out of or relating to this Agreement or the breach
thereof or otherwise arising out of the Executive’s employment or the termination of that employment (including, without limitation, any claims of unlawful employment discrimination whether based on age or otherwise) shall, to the fullest
extent permitted by law, be settled by arbitration in any forum and form agreed upon by the parties or, 

  
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in the absence of such an agreement, under the auspices of the American Arbitration Association (“AAA”) in Boston, Massachusetts in accordance with the Employment Dispute Resolution
Rules of the AAA, including, but not limited to, the rules and procedures applicable to the selection of arbitrators. In the event that any person or entity other than the Executive or the Company may be a party with regard to any such controversy
or claim, such controversy or claim shall be submitted to arbitration subject to such other person or entity’s agreement. Judgment upon the award rendered by the arbitrator may be entered in any court having jurisdiction thereof. This
Section 8 shall be specifically enforceable. Notwithstanding the foregoing, this Section 8 shall not preclude either party from pursuing a court action for the sole purpose of obtaining a temporary restraining order or a preliminary
injunction in circumstances in which such relief is appropriate; provided that any other relief shall be pursued through an arbitration proceeding pursuant to this Section 8. 

9. Consent to Jurisdiction. To the extent that any court action is permitted consistent with or to enforce Section 8 of this
Agreement, the parties hereby consent to the jurisdiction of the Superior Court of the Commonwealth of Massachusetts and the United States District Court for the District of Massachusetts. Accordingly, with respect to any such court action, the
Executive (a) submits to the personal jurisdiction of such courts; (b) consents to service of process; and (c) waives any other requirement (whether imposed by statute, rule of court, or otherwise) with respect to personal
jurisdiction or service of process. 
 10. Integration. This Agreement and the Restrictive Covenant Agreement constitute the entire
agreement between the parties with respect to the subject matter hereof and supersede all prior agreements between the parties concerning such subject matter, including the Prior Agreement. 

11. Withholding. All payments made by the Company to the Executive under this Agreement shall be net of any tax or other amounts
required to be withheld by the Company under applicable law. 
 12. Successor to the Executive. This Agreement shall inure to the
benefit of and be enforceable by the Executive’s personal representatives, executors, administrators, heirs, distributees, devisees and legatees. In the event of the Executive’s death after his termination of employment but prior to the
completion by the Company of all payments due to him under this Agreement, the Company shall continue such payments to the Executive’s beneficiary designated in writing to the Company prior to his death (or to his estate, if the Executive fails
to make such designation). 
 13. Enforceability. If any portion or provision of this Agreement (including, without limitation, any
portion or provision of any section of this Agreement) shall to any extent be declared illegal or unenforceable by a court of competent jurisdiction, then the remainder of this Agreement, or the application of such portion or provision in
circumstances other than those as to which it is so declared illegal or unenforceable, shall not be affected thereby, and each portion and provision of this Agreement shall be valid and enforceable to the fullest extent permitted by law. 

  
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 14. Survival. The provisions of this Agreement shall survive the termination of this
Agreement and/or the termination of the Executive’s employment to the extent necessary to effectuate the terms contained herein. 
 15.
Waiver. No waiver of any provision hereof shall be effective unless made in writing and signed by the waiving party. The failure of any party to require the performance of any term or obligation of this Agreement, or the waiver by any party
of any breach of this Agreement, shall not prevent any subsequent enforcement of such term or obligation or be deemed a waiver of any subsequent breach. 

16. Notices. Any notices, requests, demands and other communications provided for by this Agreement shall be sufficient if in writing
and delivered in person or sent by a nationally recognized overnight courier service or by registered or certified mail, postage prepaid, return receipt requested, to the Executive at the last address the Executive has filed in writing with the
Company or, in the case of the Company, at its main offices, attention of the Board. 
 17. Amendment. This Agreement may be amended
or modified only by a written instrument signed by the Executive and by a duly authorized representative of the Company. 
 18. Governing
Law. This is a Massachusetts contract and shall be construed under and be governed in all respects by the laws of the Commonwealth of Massachusetts, without giving effect to the conflict of laws principles thereof. 

19. Counterparts. This Agreement may be executed in any number of counterparts, each of which when so executed and delivered shall be
taken to be an original; but such counterparts shall together constitute one and the same document. 
 20. Successor to Company. The
Company shall require any successor (whether direct or indirect, by purchase, merger, consolidation or otherwise) to all or substantially all of the business or assets of the Company expressly to assume and agree to perform this Agreement to the
same extent that the Company would be required to perform it if no succession had taken place. Failure of the Company to obtain an assumption of this Agreement at or prior to the effectiveness of any succession shall be a material breach of this
Agreement. 
 21. Gender Neutral. Wherever used herein, a pronoun in the masculine or feminine gender shall be considered as including
the opposite gender as well unless the context clearly indicates otherwise. 

  
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 IN WITNESS WHEREOF, the parties have executed this Agreement effective on the date and year first
above written. 
  

			
	AVROBIO, INC.
		
	By:	 	 /s/ Bruce Booth

	Name: Bruce Booth
	Title: Chairman of the Board of Directors
	
	EXECUTIVE
	
	 /s/ Geoff MacKay

	Geoff MacKay



  
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 Schedule 1 

Approved Activities 







 Exhibit A 

Confidentiality and IP Assignment Agreement 

  
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