Document:

EXHIBIT 10.10

 

December 26, 2012 

Scott Snyder

 

Re:Offer Letter of Employment

 

Dear Scott:

 

I am pleased to provide
you with this offer letter agreement (the “Letter Agreement”), which provides the terms and conditions of your anticipated
employment by Interleukin Genetics, Inc. (“Interleukin”). We hope that you choose to join the Interleukin team and
look forward to a mutually beneficial relationship.

1.               
Start Date. If you accept this offer, your employment with Interleukin will begin on January 2, 2013 (the “Start
Date”).

 

2.               
Position and Responsibilities. Your initial position will be Chief Marketing Officer (CMO), and you will
initially work at our offices in Waltham, Massachusetts. As you progress with Interleukin, your position, job location and assignments
are, of course, subject to change. As an Interleukin employee, we expect you to devote all of your professional and working time
and energies to the business and affairs of Interleukin, and to perform any and all duties and responsibilities that are associated
with this position and such additional duties and responsibilities that the management of Interleukin otherwise may assign to you.
You agree to abide by all reasonable employment policies instituted by Interleukin, as they may be instituted or amended from time
to time. Your performance will be reviewed on a periodic basis, but no less frequently than annually, as long as you remain employed
by Interleukin.

 

3.               
At-Will Nature of Relationship. No provision of this Letter Agreement will be construed to create an express
or implied employment contract, or a promise of employment for any specific period of time. Your employment with Interleukin is
at-will employment which may be terminated by you or Interleukin at any time for any reason (or for no reason) with or without
advance notice, subject to your eligibility for specified types of severance payments upon specified types of terminations, as
described in Section 5.

 

4.               
Compensation and Benefits.

 

(a)              
Base Pay. Your initial base pay will be $265,000 on an annualized basis, less standard withholdings and deductions,
paid in accordance with Interleukin’s standard payroll procedures. Interleukin will review your base pay on an annual basis.

 

    	 

    	 

    

 

(b)Annual Bonus.

 

(i)                   
For calendar years 2013 and 2014, you will be eligible for a bonus pursuant to a bonus plan containing terms identical
to those contained in that certain Bonus Plan for Certain Executive Officers adopted and approved by the Compensation Committee
of the Interleukin Board of Directors (the “Board”) on December 21, 2012. Pursuant to such bonus, plan, you will not
be entitled to a non-discretionary bonus for calendar year 2013, but Interleukin may grant you a bonus for calendar year 2013 in
its sole discretion.

 

(ii)                 
In calendar year 2015 and any subsequent calendar year in which you are employed hereunder, you will be eligible for
a performance bonus in an amount up to a maximum of thirty percent (30%) of your annual salary, subject to the terms and conditions
of Interleukin’s bonus policy. Your annual bonus for calendar year 2015 and any subsequent calendar year will be based on
factors such as Interleukin’s evaluation of your individual performance, Interleukin’s financial performance, economic
conditions generally, and the policy terms applicable to such bonus. The amount of such annual performance bonus, if any, will
be determined by Interleukin in its sole discretion, and will be paid to you within sixty (60) days following the close of the
fiscal year to which it relates.

 

(c)Equity.
Upon approval by the Board or an authorized committee thereof, and subject to the terms and conditions of the Interleukin 2010
Incentive Plan (the “Plan”) and a stock option agreement required to be executed by you pursuant thereto (the “Stock
Option Agreement”), Interleukin will grant you incentive stock options to purchase 200,000 shares of Interleukin’s
common stock, at an exercise price equal to the fair market value of such shares on the date of grant. The terms and conditions
of the grant of the above-referenced stock options, including but not limited to the vesting schedule of such stock options, are
specifically set forth in the Plan and Stock Option Agreement.

 

(d)Vacation.
You will be entitled to twenty (20) days of vacation per year, which will accrue ratably on an annual basis, subject to the terms
and conditions of Interleukin’s vacation policy.

 

(e)Fringe Benefits.
You may take advantage of various benefits offered by Interleukin, which currently include group medical and dental insurance,
short term disability coverage, group life insurance, and a 401(k) plan. Please note that Interleukin benefits may be modified,
changed or eliminated from time to time at the sole discretion of Interleukin, and the provision of such benefits to you in no
way changes or impacts your status as an at-will employee. Where a particular benefit is subject to a formal plan (for example,
medical insurance), eligibility to participate in and receive such benefit is governed solely by the applicable plan document.

 

    	 

    	 

    

 

(f)Expense
Reimbursement. Interleukin will reimburse you for all ordinary and reasonable out-of-pocket business expenses incurred by you
in furtherance of Interleukin’s business in accordance with Interleukin’s policies with respect thereto as in effect
from time to time, including but not limited to: (i) reimbursement for up to a maximum of thirty four thousand dollars ($34,000)
of expenses, net after taxes, related to commuting travel between your residence in Pittsford, New York and Interleukin’s
offices in Waltham, Massachusetts between January 1, 2013 and December 31, 2013 and the cost of temporary housing in the Waltham,
Massachusetts vicinity between January 1, 2013 and December 31, 2013, and (ii) reimbursement for up to a maximum of sixteen
thousand dollars ($16,000) of expenses, net after taxes, related to commuting travel between your residence in New York
and Interleukin’s offices in Waltham, Massachusetts between January 1, 2014 and June 30, 2014 and the cost of temporary housing
in the Waltham, Massachusetts vicinity between January 1, 2014 and June 30, 2014. You must submit any request for reimbursement
no later than ninety (90) days following the date that such business expense is incurred. All reimbursements provided under this
Letter Agreement will be made or provided in accordance with the requirements of Section 409A (“Section 409A”) of the
Internal Revenue Code and the rules and regulations there under (the “Code”) including, where applicable, the requirement
that (A) any reimbursement is for expenses incurred during your lifetime (or during a shorter period of time specified in
this Agreement); (B) the amount of expenses eligible for reimbursement during a calendar year may not affect the expenses
eligible for reimbursement in any other calendar year; (C) the reimbursement of an eligible expense will be made no later
than the last day of the calendar year following the year in which the expense is incurred; and (D) the right to reimbursement
or in kind benefits is not subject to liquidation or exchange for another benefit.

 

5.Termination
Payments. As stated above, your employment with Interleukin is at-will employment which may be terminated by you or Interleukin
at any time for any reason, with or without advance notice. Notwithstanding for the foregoing, the parties agree to the following
regarding payments on termination.

 

(a)Termination
without Cause. If your employment hereunder is terminated by Interleukin without Cause (as defined below) at any time, and
if you execute and do not revoke a release agreement in connection with such termination (as described in Section 5(c)), then:

 

(i)                
Interleukin will pay you an amount equal to your Base Salary in effect at the time of such termination for a period
commencing on the effective date of the release agreement and ending on the six (6) month anniversary of such effective date.

 

(ii)            
Interleukin will accelerate the vesting of one hundred percent (100%) of any unvested stock options granted to you under
Section 4(c) of this Letter Agreement and the Stock Option Agreement executed pursuant thereto, subject to the terms and conditions
of the Plan and/or any such Stock Option Agreement.

 

For purposes
of this section, “Cause” means your: (i) willful misconduct or gross negligence that results in loss, damage
or injury to Interleukin; (ii) unauthorized disclosure of Interleukin trade secrets or confidential and proprietary information;
(iii) dishonesty of a material nature (including, but not limited to, theft or embezzlement of Interleukin funds or assets),
willful disloyalty, or breach of fiduciary duty to Interleukin or its shareholders; (iv) breach of your obligations under
this Letter Agreement or your Non-Competition, Non-Solicitation, Confidentiality and Assignment of Inventions Agreement; (v)
failure to perform your responsibilities or duties as an employee of Interleukin, which failure has not been cured within thirty
(30) days after written notice thereof to you by Interleukin; or (vi) commission of, or plea of guilty or nolo contendere
to, a felony (excluding minor traffic violations).

 

    	 

    	 

    

 

 

(b)              
Other Termination. If your employment hereunder is terminated by you at any time for any reason, or by Interleukin in
any circumstances or for any reason other than those specifically described in Section 5(a), then you will not be eligible for
any form of severance pay, benefits or compensation, other than Accrued Obligations described below.

 

(c)               
Release of Claims; Timing of Payment. Interleukin will not be obligated to provide you with any payment or benefit described
in Section 5(a) unless you execute and do not revoke a release agreement in a form acceptable to Interleukin, which will include
(at a minimum) a general release of claims against Interleukin and its affiliated entities and each of their officers, directors,
employees and others associated with Interleukin and its affiliated entities. The release agreement will be provided to you following
your separation of service from Interleukin, and must become effective and irrevocable before the sixtieth (60th) day
following such separation from service (the “Review Period”). If you sign and do not revoke the release agreement within
the Review Period, then applicable payments and benefits will be made or will commence, as applicable, on Interleukin’s first
regular payroll date following the release agreement’s effective date, provided that if the Review Period begins in
one taxable year of yours and ends in a later taxable year of yours, then the payment(s) will commence in the later taxable year.

 

(d)              
Payment of Accrued Obligations. You will be paid the following upon an employment termination, regardless of the reason
therefor and/or the application of any of the above sections: (i) the portion of your base pay that is accrued but not yet
paid; (ii) the portion of your vacation that is accrued and not yet used, pursuant to the terms of any applicable Interleukin
policy; and (iii) the business expenses properly incurred by you and not yet reimbursed, pursuant to the terms of any applicable
Interleukin policy. Your entitlement to any other compensation or benefit under any plan of Interleukin shall be governed by and
determined in accordance with the terms of such plans.

 

6.Your Certifications.
By signing this Letter Agreement, you are certifying and representing to Interleukin that: (a) you are free to enter into
and fully perform the duties of your position; (b) you are not subject to any employment, confidentiality, non-competition
or other agreement that would restrict your right to work for Interleukin in any way, and you have provided Interleukin with a
copy of any agreement that could be interpreted as such; (c) your employment with Interleukin does not violate any order,
judgment or injunction applicable to you, and you have provided Interleukin with a copy of any such order, judgment, or injunction;
and (d) all facts you have presented to Interleukin are accurate and true, including all oral and written statements you
have made to Interleukin pertaining to your education, training, qualifications, licensing and prior work experience on any job
application, resume or c.v., or in any interview or discussion with Interleukin.

 

    	 

    	 

    

 

 

7.                 
Confidentiality and Intellectual Property. Interleukin considers the protection of its confidential information,
proprietary materials and intellectual property to be extremely important. Consequently, as a condition of this offer of employment,
you are required to sign the enclosed Non-Competition, Non-Solicitation, Confidentiality and Assignment of Inventions Agreement.
Prior to accepting employment with any subsequent employer, you will inform such employer of any restrictions set forth therein
which apply to your activities for or employment by such employer, and permit Interleukin to do the same.

 

8.                 
Before You Start. Prior to your Start Date, you must complete the upper portion of the enclosed I-9 Form. On
your Start Date, you must provide Interleukin with the completed I-9 Form and any of the accepted forms of identification specified
on the I-9 Form. Your employment with Interleukin is conditioned on your eligibility to work in the United States.

 

9.                 
General.

 

(a)              
Entire Agreement. This Letter Agreement, along with any other agreement specifically referenced herein, constitutes
the entire agreement regarding the terms and conditions of your employment by Interleukin, and supersedes any prior agreements,
promises or statements (whether oral or written) regarding the offered terms of employment.

 

(b)              
Modification; Waiver; Assignment. This Letter Agreement’s terms may be modified or amended only by written agreement
executed by the parties hereto. This Letter Agreement’s terms may be waived, or consent for the departure therefrom granted,
only by a written document executed by the party entitled to the benefits of such terms or provisions. You may not assign your
rights and obligations hereunder without the prior written consent of Interleukin. Interleukin may assign its rights and obligations
hereunder to any person or entity that succeeds to all or substantially all of Interleukin’s business.

 

(c)               
Choice of Law; Venue; Jury Waiver. This Letter Agreement will be deemed to have been made in Massachusetts, will take
effect as an instrument under seal within Massachusetts, and will be governed by and construed in accordance with the internal
law of Massachusetts, without giving effect to conflict of law principles, and specifically excluding any conflict or choice of
law rule or principle that might otherwise refer construction or interpretation to the law of another jurisdiction. Both you and
Interleukin agree that any action, demand, claim or counterclaim relating to or arising under this Letter Agreement will be commenced
in Massachusetts in a court of competent jurisdiction by a judge alone, and you hereby waive and renounce your right to a trial
before a civil jury.

 

    	 

    	 

    

 

 

(d)Code Sections 409A and 280G.

 

(i)              
The benefits set forth in Section 5(a) constitute “non-qualified deferred compensation” subject to Section
409A of the Code. Any termination of your employment triggering payment of benefits under Section 5(a) must constitute a “separation
from service” under Section 409A(a)(2)(A)(i) of the Code and Treas. Reg. §1.409A-1(h) before distribution of such benefits
can commence. To the extent that the termination of your employment does not constitute a separation of service under Section 409A(a)(2)(A)(i)
of the Code and Treas. Reg. §1.409A-1(h) (as the result of further services that are reasonably anticipated to be provided
by you to Interleukin at the time your employment terminates), any benefits payable under Section 5(a) that constitute deferred
compensation under Section 409A will be delayed until after the date of a subsequent event constituting a separation of service
under Section 409A(a)(2)(A)(i) of the Code and Treas. Reg. §1.409A-1(h). For purposes of clarification, this Section will
not cause any forfeiture of benefits on your part, but will only act as a delay until such time as a “separation from service”
occurs. Further, if you are a “specified employee” (as that term is used in Section 409A and regulations and other
guidance issued thereunder) on the date your separation from service becomes effective, any benefits payable under Section 5(a)
that constitute non-qualified deferred compensation subject to Section 409A will be delayed until the earlier of (A) the business
day following the six-month anniversary of the date your separation from service becomes effective, and (B) the date of your death,
but only to the extent necessary to avoid the adverse tax consequences and penalties under Section 409A; on the earlier of (X)
the business day following the six-month anniversary of the date your separation from service becomes effective, and (Y) your death,
Interleukin will pay you in a lump sum the aggregate value of the non-qualified deferred compensation that Interleukin otherwise
would have paid you prior to that date under Section 5(a). It is intended that each installment of the payments and benefits provided
under Section 5(a) will be treated as a separate “payment” for purposes of Section 409A. Neither Interleukin nor you
will 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.

 

(ii)            
The parties intend this Letter Agreement to be in compliance with Section 409A. You acknowledge and agree that Interleukin
does not guarantee the tax treatment or tax consequences associated with any payment or benefit arising under this Letter Agreement,
including but not limited to consequences related to Section 409A. Notwithstanding any other provision to the contrary, this Letter
Agreement will be interpreted and at all times administered in a manner that avoids the inclusion of compensation in income under
Section 409A, or the payment of increased taxes, excise taxes or other penalties under Section 409A.

 

(iii)           If
any payment or benefit you would receive under this Letter Agreement, when combined with any other payment or benefit you
receive pursuant to a Change of Control (for purposes of this section, a “Payment”) would: (A) constitute a
“parachute payment” within the meaning of Section 280G the Code; and (B) but for this sentence, be subject to the
excise tax imposed by Section 4999 of the Code (the “Excise Tax”), then such Payment will be either: (X) the full
amount of such Payment; or (Y) 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 employments 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.

 

[Signature Page to Follow]

 

    	 

    	 

    

 

This Letter Agreement
may be executed in two or more counterparts, each of which will be deemed an original, but all of which together will constitute
one and the same instrument. You may accept this offer of employment and the terms and conditions hereof by signing the enclosed
additional copy of this Letter Agreement. This offer will expire on January 2, 2013, unless accepted by you or revoked by Interleukin
prior to that date.

 

 

	 	Sincerely,
	 	INTERLEUKIN GENETICS, INC.
	 	 
	 		/s/ Kenneth S. Kornman
	 	 	Kenneth
    S. Kornman

 

 

Agreed to and Acknowledged:

 

/s/ Scott Snyder_____________

Scott Snyder

 

February 5, 2013____________

Date[Face of Certificate - ZION OIL &
GAS, INC.]

 

(SEE REVERSE SIDE FOR LEGEND)

 

W

 

WARRANTS

 

(THIS WARRANT WILL BE VOID IF NOT EXERCISED
PRIOR TO 5:00 P.M., EASTERN TIME, September 30, 2018)

 

ZION OIL & GAS, INC.

 

CUSIP 989696 141

 

WARRANT

 

THIS CERTIFIES THAT, for value received _____________ is the
registered holder of a Warrant or Warrants expiring September 30, 2018 (the "Warrant") to purchase one fully paid and
non-assessable share of Common Stock, par value $.01 per share (the "Share"), of ZION OIL & GAS, INC., a Delaware
corporation (the "Company"). The Warrant entitles the holder thereof to purchase from the Company, commencing on September
30, 2013, one Share of the Company at the price of $2.00 per share, upon surrender of this Warrant Certificate and payment of the
Warrant Price at the office or agency of the Warrant Agent, Registrar and Transfer Company (such payment to be made by check made
payable to the order of the Warrant Agent), but only subject to the conditions set forth herein and in the Warrant Agreement between
the Company and the Warrant Agent. In no event shall the registered holder of this Warrant be entitled to receive a net-cash settlement
or other consideration in lieu of physical settlement in Shares of the Company. The Warrant Agreement provides that, upon the occurrence
of certain events, the Warrant Price and the number of Warrant Shares purchasable hereunder, set forth on the face hereof, may,
subject to certain conditions, be adjusted. The term Warrant Price as used in this Warrant Certificate refers to the price per
Share at which Shares may be purchased at the time the Warrant is exercised.

 

This Warrant may expire on the date first above written if it
is not exercised prior to such date by the registered holder pursuant to the terms of the Warrant Agreement.

 

No fraction of a Share will be issued upon any exercise of a
Warrant. If, upon exercise of a Warrant, a holder would be entitled to receive a fractional interest in a Share, the Company will,
upon exercise, round up to the nearest whole number the number of shares of common stock to be issued to the warrant holder.

 

Warrant Certificates, when surrendered at the office or agency
of the Warrant Agent by the registered holder hereof in person or by attorney duly authorized in writing, may be exchanged in the
manner and subject to the limitations provided in the Warrant Agreement, but without payment of any service charge, for another
Warrant Certificate or Warrant Certificates of like tenor and evidencing in the aggregate a like number of Warrants.

 

    	 

    	 

    

 

Upon due presentment for registration of transfer of
the Warrant Certificate at the office or agency of the Warrant Agent, a new Warrant Certificate or Warrant Certificates of like
tenor and evidencing in the aggregate a like number of Warrants shall be issued to the transferee in exchange for this Warrant
Certificate, subject to the limitations provided in the Warrant Agreement, without charge except for any applicable tax or other
governmental charge.

 

The Company and the Warrant Agent may deem and treat the registered
holder as the absolute owner of the Warrants represented by this Warrant Certificate (notwithstanding any notation of ownership
or other writing hereon made by anyone) for the purpose of any exercise hereof, of any distribution to the registered holder, and
for all other purposes, and neither the Company nor the Warrant Agent shall be affected by any notice to the contrary.

 

 

This Warrant does not entitle the registered holder to any of
the rights of a stockholder of the Company.

 

COUNTERSIGNED:

Registrar and Transfer Company

 

WARRANT AGENT

BY:

AUTHORIZED OFFICER

 

DATED:

 

(Signature)

CHIEF EXECUTIVE OFFICER

 

(Seal)

 

(Signature)

SECRETARY

 

 

 

 

    	 

    	 

    

 

SUBSCRIPTION FORM

 

To Be Executed by the Registered Holder
in Order to Exercise Warrants

 

The undersigned Registered Holder irrevocably elects to exercise
_________ Warrants represented by this Warrant Certificate, and to purchase the shares of Common Stock issuable upon the exercise
of such Warrants, and requests that Certificates for such shares shall be issued in the name of

  

 

(PLEASE TYPE OR PRINT NAME AND ADDRESS)

  

 

 

 

(SOCIAL SECURITY OR TAX IDENTIFICATION NUMBER)

 

	and be delivered to	 

 

(PLEASE PRINT OR TYPE NAME AND ADDRESS)

  

 

and, if such number of Warrants shall not be all the Warrants
evidenced by this Warrant Certificate, that a new Warrant Certificate for the balance of such Warrants be registered in the name
of, and delivered to, the Registered Holder at the address stated below:

 

	Dated:	 
	 	 
	 	 
	(SIGNATURE)	 
	 	 
	 	 
	(ADDRESS)	 
	 	 
	 	 
	 	 

 

(TAX IDENTIFICATION NUMBER)

 

 

 

THE SIGNATURE TO THE ASSIGNMENT OF THE SUBSCRIPTION FORM MUST
CORRESPOND TO THE NAME WRITTEN UPON THE FACE OF THIS WARRANT CERTIFICATE IN EVERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT
OR ANY CHANGE WHATSOEVER, AND MUST BE GUARANTEED BY A COMMERCIAL BANK OR TRUST COMPANY OR A MEMBER FIRM OF THE AMERICAN STOCK EXCHANGE,
NEW YORK STOCK EXCHANGE, PACIFIC STOCK EXCHANGE OR CHICAGO STOCK EXCHANGE.

 

    	 

    	 

    

 

  

ASSIGNMENT

 

To Be Executed by the Registered Holder in Order to Assign Warrants

 

For Value Received,_____________________hereby sell, assign,
and transfer unto

 

_____________________________________________________

(PLEASE TYPE OR PRINT NAME AND ADDRESS)

 

_____________________________________________________

 

_____________________________________________________

 

_____________________________________________________

(SOCIAL SECURITY OR TAX IDENTIFICATION NUMBER)

 

	and be delivered to	 

 

(PLEASE PRINT OR TYPE NAME AND ADDRESS)

    

 

Of the Warrants represented by this Warrant Certificate, and
hereby irrevocably constitute and

 

appoint________________________________Attorney to transfer
this Warrant Certificate on the books of the Company, with full power of substitution in the premises.

 

	Dated:	 
	 	 

 

(SIGNATURE)

 

Notice: The signature to this assignment must correspond with
the name as written upon the face of the certificate in every particular, without alteration or enlargement or any change whatever.

 

Signature(s) Guaranteed:

 

By__________________________________ 

THE SIGNATURE(S) MUST BE GUARANTEED BY AN ELIGIBLE GUARANTOR
INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE
MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15).

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