Exhibit 10.39

Date: October 1, 2017

CONFIDENTIAL SEVERANCE AGREEMENT AND GENERAL RELEASE

The purpose of this Confidential Severance Agreement and General Release is to set forth the terms of Mary Cullinane’s (“you” or “your”) separation from Houghton Mifflin Harcourt Publishing Company and/or any of its affiliates (collectively, the “Company”) and your eligibility for severance benefits under the Houghton Mifflin Harcourt Publishing Company ELT Severance Plan (the “Severance Plan”). You are entitled to the severance benefits described below only if you agree to and comply with the terms of this Agreement.

WHEREAS, you and the Company desire to enter into an agreement regarding your separation of employment from the Company and a release of claims;

NOW, THEREFORE, in consideration of the mutual promises and agreements contained herein and for other good and valuable consideration, the sufficiency and receipt of which are hereby acknowledged, you and the Company agree as follows:

1. Separation of Employment. Your employment with the Company will terminate at the close of business on October 1, 2017 (the “Separation Date”). You acknowledge that from and after the Separation Date, you have no authority to, and shall not represent yourself as an employee or agent of the Company.

2. Severance Benefits. Subject to the terms of this Agreement, the Company will provide you with the benefits described below (collectively, the “Severance Benefits”) in accordance with and subject to the terms of the Severance Plan:

(a) Severance Pay. Subject to the terms of this Agreement and provided that you sign and return this Agreement to the Company within 21 days of your receipt hereof, comply with its terms, and do not revoke the Agreement in accordance with Paragraph 13 below, the Company will pay you severance pay during the 78-week period immediately following the Separation Date at your current weekly rate of $9,615.38 less withholding for taxes and other applicable deductions, in accordance with the Company’s normal payroll schedule and practice. The Company will make the first payment as soon as practicable following your timely execution of this Agreement and the expiration of the revocation period without your revocation. The first payment will cover the time period from the day after your Separation Date until the first practicable regularly scheduled pay date following your execution of the Agreement and the end of the revocation period. In no event will payments be made later than the last day of the second taxable year following your Separation Date.

(b) Pro-Rata Bonus. You will remain eligible for payment opportunity under the Achievement Metric Component of the Houghton Mifflin Harcourt Company 2017 Bonus Plan – US, ELT- Corporate segment (“Bonus Plan”), to the extent the terms of the plan so provide, except that (i) the eligibility requirement that you be employed on the date that bonuses are paid shall be waived, and (ii) we will prorate your bonus at 75 percent to reflect the number of days you were employed during 2017 (274/365). Except as set forth herein, the determination of the amount of payment, if any, and timing of any payment will be made at the time and in accordance with the terms of the Bonus Plan. Any such payment will be subject to required and authorized withholdings and deductions. You acknowledge and agree that the Bonus Plan identified above is the only incentive, commission, or bonus plan in which you are currently a participant.

(c) Outplacement Services. The Company will provide you with 12 months of career counseling, which will be available from Right Management as soon practicable following your timely execution of this Agreement and the expiration of the revocation period, without your revocation. You must contact Right Management within two months of your Separation Date to receive these services.

You shall remain eligible for the Severance Benefits even if you secure other employment with an employer other than the Company or any of its affiliates prior to or while receiving such benefits. If you become re-employed by the Company or any of its affiliates while receiving Severance Benefits, you shall have no further right to any unpaid or unused Severance Benefits, which shall end immediately upon rehire. You acknowledge and agree that you would not be entitled to the Severance Benefits if you had not signed this Agreement.

You are eligible for the Severance Benefits described herein pursuant to the Severance Plan and subject its terms, including its claims procedures. In the event of an inconsistency between this Agreement and the Severance Plan, the provisions of this Agreement will govern.

3. Accelerated Retention Bonus. Even if you do not sign this Agreement, the Company will accelerate payment of the $250,000 retention bonus, less applicable taxes and withholdings, described in the letter to you dated September 22, 2016. Such payment will be made within 30 days following the Separation Date.

4. Unused Vacation. You acknowledge and agree that you have used all of your accrued vacation time before the Separation Date and that as of the Separation Date, you have no accrued, unused vacation.

5. Employee Benefits. Except as set forth in this Agreement or as otherwise required by applicable law, your participation in and rights under any Company employee benefit plans and programs will be governed by the terms and conditions of those plans and programs, which may be amended, modified, suspended or terminated by the Company at any time for any or no reason to the extent permitted by law.

6. Stock Options and Restricted Stock. Nothing in this Agreement is intended to modify the Company’s or your rights and obligations (and restrictions on such rights and obligations, including but not limited to those in the Company’s Securities Trading Policy) with respect to awards of stock options, time-based restricted stock units (“RSUs”), performance-based restricted stock units (“PSUs”), performance-based restricted stock (“PSAs”), time-based restricted stock (“RSAs”) or any other outstanding equity awards (collectively, “Awards”) made under the HMH Holdings (Delaware), Inc. 2012 Management Incentive Plan (“MIP”) or the Houghton Mifflin Harcourt Company 2015 Omnibus Incentive Plan (“OIP”), including without limitation your right to exercise vested options following the Separation Date and your forfeiture of all stock options, RSUs, PSUs, PSAs and RSAs and other Awards that, in each instance, have not vested on or before the Separation Date in accordance with the terms of the applicable Award agreements. The terms of the applicable Award agreements and plan documents remain in effect with respect to such Awards; for avoidance of doubt, your employment is being terminated without Cause thereunder, as defined in the MIP and the OIP, as applicable.

(a) You, and anyone claiming through you or on your behalf, waive the right to assert and further agree to release and discharge the Company and the other Released Parties (as defined below) with respect to any and all Claims (as defined below), whether

currently known or unknown, that you now have, have ever had, or may ever have against the Company and any of the other Released Parties arising from or related to any fact, agreement, act, omission, or thing occurring or existing at any time prior to or on the date on which you sign this Agreement. Without limiting the foregoing, the Claims released by you hereunder include, but are not limited to:

(i) all Claims for or related in any way to your employment, compensation, other terms and conditions of employment, or termination from employment with the Company, including without limitation all claims for salary, wages, bonus, incentive, stock, stock options (including all Claims under the MIP, the OIP and the Awards, except for Claims related to vested stock options, RSUs, PSUs, PSAs and RSAs), severance pay, employee benefits or any other compensation or benefit;

(ii) all Claims that were or could have been asserted by you or on your behalf: (A) in any federal, state, or local court, commission, or agency; (B) under any common law theory; or (C) under any contract, tort, federal, state, or local law, statute, regulation, ordinance, constitutional provision, administrative code, rule or executive order; and

(iii) all Claims that were or could have been asserted by you or on your behalf arising under any of the following laws, as amended from time to time: the Age Discrimination in Employment Act; the Older Workers Benefit Protection Act; Title VII of the Civil Rights Act of 1964; the Americans with Disabilities Act; the Genetic Information Nondiscrimination Act; the Equal Pay Act of 1963; the Rehabilitation Act of 1973; the National Labor Relations Act; the Employee Retirement Income Security Act; the Family and Medical Leave Act; the Worker Adjustment and Retraining Notification Act; the Uniformed Services Employment & Reemployment Rights Act; the Massachusetts Fair Employment Practices Act, M.G.L. c. 151B, § 1 et seq.; the Massachusetts Civil Rights Act, M.G.L. c. 12, §§ 11H and 11I; the Massachusetts Equal Rights Act, M.G.L. c. 93, § 102 and M.G.L. c. 214, § 1C; the Massachusetts Labor and Industries Act, M.G.L. c. 149, § 1 et seq.; the Massachusetts Payment of Wages Act, M.G.L. c. 149, §§ 148 et seq.; the Massachusetts Privacy Act, M.G.L. c. 214, § 1B; and the Massachusetts Maternity Leave Act, M.G.L. c. 149, § 105(d); and all other federal, state and local laws, statutes, regulations or ordinances, including any ‘‘whistleblower” law, statute, regulation or ordinance, prohibiting discrimination or pertaining to employment.

(b) Notwithstanding the foregoing terms, you do not waive or release (i) any claim for the Severance Benefits; (ii) any right or claim that may not legally be waived; or (iii) any vested benefits under the Company’s employee benefit plans and programs.

(c) The term “Released Parties” as used in this Agreement means: (i) the Company and its past, present, and future parents, divisions, subsidiaries, partnerships, affiliates, and other related entities (whether or not they are wholly owned); (ii) the past, present, and future owners, trustees, fiduciaries, administrators, shareholders, directors, officers, partners, agents, representatives, members, associates, employees and attorneys of each entity listed in subpart (i) above; and (iii) the predecessors, successors, and assigns of each entity listed in subparts (i) and (ii) above.

(d) The terms “Claim” and “Claims” as used in this Paragraph 7 are intended to be as broad as the law allows and mean any and all charges, complaints, and other forms of action against any of the Released Parties, seeking any form of relief including, without limitation, equitable relief (Whether declaratory, injunctive or otherwise), the recovery of any damages, or any other form of monetary recovery whatsoever (including, without limitation, back pay, front pay, compensatory damages emotional distress damages, punitive damages, liquidated damages, treble damages, consequential damages, attorneys’ fees, and any other costs) against any of the Released Parties.

(e) This Release does not prohibit you from filing a charge of discrimination with the Equal Employment Opportunity Commission (“EEOC”) or any state or local human rights agency. Nor does this Agreement prevent you from participating in any investigation or proceeding conducted by the EEOC or any state or local agency. However, the Agreement does preclude the recovery of monetary damages, including attorney’s fees and costs, against the Released Parties for any charge or claim of discrimination and you hereby waive any right to any relief, including the right to damages, attorney’s fees and costs in connection with any charge or claim for discrimination.

8. Employee’s Representations. You represent and warrant that: (a) you have not filed any complaint, charge or claim or initiated any other legal proceedings against any of the Released Parties; (b) no such proceedings have been initiated against any of the Released Parties on your behalf; (c) you are the sole owner of the claims that are released in Paragraph 7 above; (d) none of these claims has been transferred or assigned or caused to be transferred or assigned to any other person, firm or other legal entity; and (e) you have the full right and power to grant, execute, and deliver the releases, undertakings, and agreements contained in this Agreement.

9. No Compensation Owing. Except as provided in this Agreement, you acknowledge and agree that you are not entitled to and will not receive any payments, benefits, or recovery of any kind from the Company or other Released Parties, including but not limited to any salary, wages, commissions, incentive, holiday pay, vacation pay, stock options, stock, bonuses or severance. In the event of any further proceedings whatsoever based upon any matter released herein, the Company and each of the other Released Parties shall have no further monetary or other obligation of any kind to you, including without limitation any obligation for any costs, expenses and attorney’s fees incurred by or on behalf of you.

10. Company Property; Confidentiality and Non-Disparagement. You acknowledge and agree to the following:

(a) You have returned all documents (whether in hard copy or electronic form) and other property of the Company and the other Released Parties, including all property containing any confidential or Proprietary Information (defined below), to the Company and you have not retained any copies thereof. Notwithstanding the terms of Paragraph 2, none of the Severance Benefits will be paid or available to you until you have returned all Company property, paid any and all personal charges charged to your Company-issued credit card or any other Company account, and repaid any and all cash advances or other advances (including but not limited to tuition reimbursement repayable pursuant to the applicable policy and advance of vacation time not yet accrued) provided to you by the Company.

(b) You shall abide by all common law and/or statutory obligations relating to protection and non-disclosure of the Company’s confidential and Proprietary Information (defined below). Additionally, you shall regard and preserve as confidential all Proprietary Information pertaining to the Company that has been obtained by you in the course of employment with the Company, whether such information is in your memory or in writing or other physical or electronic form. Except as required by law, you will not, without written consent and authority from the Company, use for your benefit or purpose or disclose to others any Proprietary Information. Further, the terms of the Non-Competition, Non-Solicitation and confidentiality Agreement dated November 1, 2011 and the Confidentiality and intellectual

Property Agreement dated January 5, 2012 are incorporated herein and shall survive the signing of this Agreement and you hereby reaffirm your obligation to abide fully by the provisions of such agreements.

(c) For purposes of this Agreement, “Proprietary Information” shall mean information relating to the business and operations of the Company that has not previously been publicly released by duly authorized representatives of the Company including, but not limited to, all research memorandum, designs, plans, proposals, marketing, sales plans, financial information, costs, pricing information, customer and supplier information, trade secrets, proprietary processes, specifications, expertise, techniques, and ideas reasonably related to the business and operations of the Company. To the extent the Non-Competition and Non-Solicitation Agreement dated November 1,2011 and/or the Confidentiality and Intellectual Property Agreement dated January 5, 2012 provides for greater obligations with regard to confidential or proprietary information then the terms affording the Company the broadest protection shall apply.

(d) Except as required by law, you shall not disclose the existence or terms of this Agreement to any third parties with the exception of your financial advisor(s), attorney(s), and immediate family member(s), provided that each such person shall be bound by this confidentiality provision and you shall ensure such confidentiality. You will give the Company immediate notice and a copy of any subpoena or other legal requirement that you make any otherwise prohibited disclosure, prior to making any such disclosure to the extent practicable. Notwithstanding the foregoing, nothing in this paragraph shall prevent you from participating in an investigation by a federal, state or local governmental agency.

(e) You shall refrain from all conduct, verbal or otherwise, that disparages or damages or could disparage or damage the reputation, goodwill, or standing in the community of the Company or any of the other Released Parties.

(f) You acknowledge and agree that the requirements of this paragraph are among the material inducements for the Company to enter into this Agreement. A breach of any provision in this Paragraph 10 shall constitute a material breach of this Agreement and, in addition to any other legal or equitable remedy available to the Company, shall entitle the Company to (i) recover any amounts paid to you under Paragraph 2, and (ii) stop providing you with any additional Severance Benefits.

11. No Admission. Nothing in this Agreement is intended to or shall be construed as an admission by the Company or any of the other Released Parties that any of them violated any law, interfered with any right, breached any obligation or otherwise engaged in any improper or illegal conduct with respect to you or otherwise. The Company and the other Released Parties expressly deny any such illegal or wrongful conduct.

12. No Third Party Beneficiary. The Severance Benefits described in this Agreement do not confer any right to a benefit upon any other individual or any employee of the Company. Although the Severance Benefits described in this Agreement may be offered generally to other employees of the Company in exchange for a signed agreement similar to this one, the Company specifically reserves its right to amend, modify or terminate the terms and conditions of severance offered to any other employee, and the terms of this Agreement shall not create any right or expectation in any other individual that he or she is entitled to or will receive the same or a similar benefit.

13. ADEA Waiver Information/Revocation Period/Effective Date. It is the Company’s intent to make certain that you fully understand the provisions and effects of this Agreement, including your waiver and release of claims. By signing this Agreement you acknowledge that you knowingly and voluntarily entered into this Agreement with the purpose of waiving any rights and releasing any claims under the Age Discrimination in Employment Act of 1967 (the “ADEA”). Specifically, you acknowledge and agree that:

14. Entire Agreement/Waiver/Choice of Law/Jury Waiver.

(a) You acknowledge and agree that, with the exception of any agreements incorporated in Paragraph 10 above, this Agreement supersedes any and all prior or contemporaneous oral and/or written agreements between you and the Company, and sets forth the entire agreement between you and the Company. No variations or modifications of this Agreement shall be deemed valid unless reduced to writing and signed by you and the Company.

(b) The failure of the Company to seek enforcement of any provision of this Agreement in any instance or for any period of time shall not be construed as a waiver of such provision or of the Company’s right to seek enforcement of such provision in the future.

(c) This Agreement shall be deemed to have been negotiated and made in Massachusetts, shall take effect as an instrument under seal within Massachusetts, and shall be governed by and construed in accordance with the laws of Massachusetts, without giving effect to conflict of law principles.

(d) You agree that any action, demand, claim or counterclaim relating to the terms and provisions of this Agreement, or to its breach, shall be commenced in Massachusetts in a court of competent jurisdiction, and further acknowledge that venue for such actions shall lie exclusively in Massachusetts and that material witnesses and documents would be located in Massachusetts. You also agree that a court in Massachusetts will have personal jurisdiction over you and you waive any right to raise a defense of lack of personal jurisdiction by such a court.

(e) Both parties hereby waive and renounce in advance any right to a trial by jury in connection with any action, demand, claim or counterclaim relating to the terms and provisions of this Agreement, or to its breach.

(f) if any provision of this Agreement is held to be unenforceable, such provision shall be considered to be distinct and severable from the other provisions of this Agreement, and such unenforceability shall not affect the validity and enforceability of the remaining provisions. If any provision of this Agreement is held to be unenforceable as written but may be made enforceable by (limitation, then such provision shall be enforceable to the maximum extent permitted by applicable law.

(g) Section headings in this Agreement are used for convenience or reference only and shall not affect the meaning of any provision of this Agreement

15. Voluntary Agreement. By executing this Agreement, you acknowledge that you have been afforded sufficient time to understand the terms and effects of this Agreement, that your agreements and obligations hereunder are made voluntarily, knowingly and without duress, and that neither the Company nor its agents or representatives have made any representations inconsistent with the provisions of this Agreement.

To accept the terms of this Agreement, please sign and date this Agreement, initial each page, and return the signed and initialed copy of this Agreement to Marianne Congdon-Hohman, Interim SVP Human Resources, within 21 days of your receipt of this Agreement.

THE PARTIES STATE THAT THEY HAVE READ AND UNDERSTAND THE TERMS OF THIS AGREEMENT AND KNOWINGLY AND VOLUNTARILY INTEND TO BE BOUND BY THEM: