Document:

Offer Letter by and between the Company and Margaret A. Horn

 Exhibit 10.36 
  

			
	

	  	 3832 Bay Center Place
 Hayward, CA 94545
 Tel: 510-732-8400
 Fax: 510-732-8401
 www.kosan.com

  
 12/1/2005 
  
 Margaret A. Horn

  
 Dear Peg, 
  
 On behalf of Kosan Biosciences Incorporated, I am pleased to extend to you an offer of
employment for the position of Senior Vice President/General Counsel. In this position you will report to the Chief Executive Officer. This letter sets forth the terms and conditions of your employment with Kosan. 
  
 In this position you will serve as the chief legal advisor of the company, counseling
management on the legal implications of all company activities, and serving as a Company officer and member of the executive team. You will manage the legal functions of the organization, including but not limited to the following: patent and
copyright matters, coordination of legal matters handled by outside counsel, legal defense and prosecution of claims in litigation, pre-litigation dispute resolution and interpretation and preparation of legal documents and reports. In addition, you
would have the Business Development group reporting to you, and I would closely work with you to make this endeavor successful. 
  
 Your monthly salary will be $25,000 ($300,000 on an annualized basis). You will be eligible to participate in all benefit plans and programs available to executives at
your level (including any change in control plan adopted by the board), including 4 weeks of paid vacation per year. Your coverage under Kosan’s current benefit plans will become effective on your first day of full-time work at Kosan (your
“start date”). Subject to the provisions of this letter relating to termination other than for Cause, the Company may change your compensation and benefits, as it deems necessary. Normal business hours are from 8:30 a.m. to 5:30 p.m.,
Monday through Friday. As an exempt salaried employee, you will be expected to work additional hours as required by the nature of your work assignments, and you will not be eligible for overtime pay. You will work at Kosan’s headquarters in
Hayward, California. Of course, subject to the provisions of this letter relating to termination other than for Cause, Kosan may change your position, reporting relationship, duties and work location from time to time, as it deems necessary. Your
start date will be December 1, 2005. 
  
 As soon as you accept this offer, I
will recommend to the Board of Directors that you be granted an option to purchase 150,000 shares of Kosan Common Stock under the Kosan Stock Option Plan (the “Plan”). The option shares will vest over four years, with one-fourth vesting
after one year of employment and the remainder vesting in equal monthly increments over the remaining three years as provided in the Plan; 

 provided, however, that if your employment with Kosan is terminated involuntarily (or voluntarily with Good Reason
(defined below)) within your first one year of employment for any reason other than Cause (defined below), one-eighth of the option shares will vest as of the date of termination of your employment, provided that you sign the general release
of claims described below with respect to severance benefits. This option grant is subject to the approval of the Board and your execution of our standard Stock Option Agreement. The exercise price will be equal to the fair market value of the stock
on the date the Board or the Compensation Committee approves the stock option, but no earlier than your first day of employment. 
  
 You will also be eligible to participate in our bonus plan under which you can earn up to 25% of your annual salary based on achieving your goals and objectives and
subject to the terms of the plan. 
  
 As a condition of your employment, you must
carefully review, sign, and comply with the enclosed Employee Proprietary Information and Invention Assignment Agreement. Also as a condition of your employment, you agree to abide by the Company’s policies and procedures, as adopted from time
to time, and to refrain from any activities that conflict with your obligations to the Company. You represent that you do not have any agreements with any third parties (e.g., former employers), including but not limited to noncompetition or
proprietary information agreements, that will conflict with or limit your ability to discharge your duties to Kosan. You agree that, in the course of your work for Kosan, you will not make any unauthorized use or disclosure of any proprietary
information or materials of any third party (e.g., a former employer). 
  
 Your
employment with the Company is for no specified period and constitutes at will employment. As a result, you are free to resign at any time, for any reason or for no reason. Similarly, the Company is free to conclude its employment relationship with
you at any time, with or without cause, and with or without notice. 
  
 If your
employment with Kosan is terminated involuntarily (or voluntarily with Good Reason) within the first one year of employment for any reason other than Cause, you will be provided six (6) months of severance (minus appropriate payroll/tax
deductions) in the form of salary continuation, provided that (a) you sign a general release of claims in a form reasonably satisfactory to Kosan, and (b) in the event the Company determines in good faith that such payments would be
subject to Section 409A(a)(1) of the Code if paid within the time contemplated by this Agreement, then such payments will be delayed to the minimum extent necessary to avoid the application of Section 409A(a)(1) to such payments. As used
in this letter agreement “Cause” shall mean (i) any material breach by you of this agreement or the Employee Proprietary Information and Invention Assignment Agreement which is not cured within 30 days after written notice of breach
(if the breach is reasonably susceptible of being cured); (ii) your conviction of a felony or crime involving moral turpitude, (iii) theft, dishonesty, fraud, or willful neglect, misconduct or misrepresentation in connection with, or in
the course of, carrying out your duties and responsibilities; or (iv) insubordination or refusal to perform reasonable and lawful directives from your superiors, which you fail to correct within 15 days after written notice if such conduct is
reasonably susceptible of being cured). “Good Reason shall mean (i) a reduction in your annual base salary; (ii) a material reduction in your package of benefits and incentives (except for changes which are consistent with changes
made for all Company executives); (iii) any substantial diminution of your duties, responsibilities or authority (excluding any change mutually agreed to in reporting structure such that you would report to an Executive Vice President or other
more senior officer whose overall responsibilities include, but are not limited to, legal matters and business development activities); (iv) any relocation of your place of employment more than 35 miles from Kosan’s current location; or
(v) a material breach of this Agreement by Kosan. 
  
 The Immigration Reform
and Control Act of 1986 requires that every person present to potential employers proof of identity and eligibility or authorization to accept employment in the United States. In order to comply with this law, and before you can become a Kosan
employee, you must provide appropriate documentation to prove both your identity and legal eligibility to be employed by Kosan. Acceptable forms of documentation are described on the attachment to this offer letter. Please be sure to bring this
documentation with you on your first day of employment. 

 To aid in the rapid and economical resolution of disputes that may arise between us, you and Kosan agree that any and all
disputes, claims, or demands in any way arising out of or relating to the terms of this letter agreement, your employment with Kosan, or the termination of your employment with Kosan, shall be resolved, to the fullest extent permitted by law, by
final, binding and confidential arbitration in San Francisco, California, conducted before a single arbitrator by JAMS, Inc. (“JAMS”) or its successor, under the then-applicable JAMS rules. You acknowledge that by agreeing to this
arbitration procedure, you and Kosan waive the right to resolve any such dispute, claim or demand through a trial by jury or judge or by administrative proceeding. You will have the right to be represented by legal counsel at any arbitration
proceeding. The arbitrator shall: (a) have the authority to compel adequate discovery for the resolution of the dispute and to award such relief as would otherwise be available under applicable law in a court proceeding; and (b) issue a
written statement signed by the arbitrator regarding the disposition of each claim and the relief, if any, awarded as to each claim, the reasons for the award, and the arbitrator’s essential findings and conclusions on which the award is based.
Kosan shall pay all JAMS’ arbitration fees. Nothing in this offer letter is intended to prevent either you or Kosan from obtaining injunctive relief in court to prevent irreparable harm pending the conclusion of any arbitration. 
  
 This letter, (together with your Employee Proprietary Information and Inventions Agreement
and any stock option grant agreement you receive) constitutes the complete and exclusive statement of your agreement with Kosan concerning the subject matter hereof. It supersedes any other agreements or promises made to you by anyone, whether oral
or written, and it cannot be changed except in a written agreement, signed by you and a duly authorized officer of Kosan. 
  
 We are very excited at the prospect of your joining Kosan Biosciences and becoming a key contributor to our efforts. Please do not hesitate to contact Human Resources if
you have any questions. This offer will remain open until December 1, 2005 at which time it will expire if not previously accepted in writing. 
  
 To indicate your acceptance of our offer, please sign and date one copy of this letter and the Employee Proprietary Information and Invention Assignment Agreement and
return them to me. 
  

					
	Sincerely,	 	 
		
	Kosan Biosciences	 	UNDERSTOOD AND ACCEPTED:
			
	By:	  	 /s/ Daniel V. Santi

	 	 /s/ Margaret A. Horn

	 	  	Daniel V. Santi, M.D., Ph.D.	 	Margaret A. Horn
	 	  	 	 	 
	 	  	Chairman and CEO	 	 
	 	  	 	 	Date: December 1, 2005
	cc:	  	Susan M. Kanaya	 	 
	 	  	SVP, Finance and CFO	 	Date employment begins:
	 	  	Email: kanaya@kosan.com	 	 
	 	  	 	 	December 1, 2005Compensation information for named executive officers

 Exhibit 10.37 
  
 COMPENSATION INFORMATION FOR NAMED EXECUTIVE OFFICERS 
  
 The table below provides information regarding the 2005 cash bonus, December 2, 2005 stock option grant, 2006 annual base salary and
2006 target cash bonus of each named executive officer of Kosan Biosciences Incorporated listed below. 
  

												
	 Executive Officer

	  	2005 Cash Bonus

	  	 Stock Option
Grant*
 (# shares)

	  	2006 Annual
Base Salary

	  	2006 Target
Cash Bonus**

	 
	 Daniel V. Santi, M.D., Ph.D., 
 Chief Executive Officer
	  	$	105,000	  	78,750	  	$	445,000	  	45	%
					
	 Robert Johnson Jr., M.D., Ph.D., 
 Executive Vice President, Development and Chief Medical Officer
	  	$	75,000	  	52,500	  	$	365,000	  	30	%
					
	 Susan M. Kanaya, 
 Senior Vice President, Finance and Chief Financial Officer
	  	$	57,000	  	37,500	  	$	305,000	  	30	%
					
	 Margaret A. Horn
 Senior Vice President and General Counsel
	  	 	N/A	  	150,000	  	$	300,000	  	30	%

	*	Granted by the Compensation Committee of the Board of Directors of the Company on December 2, 2005, with an exercise price per share equal to the closing price as reported on
the Nasdaq National Market on December 1, 2005. 

	**	Percentage of each named executive officer’s 2006 annual base salary.

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