Document:

EXHIBIT
10.1 

[Geron Letterhead]

September 24, 2013

Melissa A. Behrs
[Home Address]

     RE:   First Amendment to Employment
Agreement

Dear Melissa:

By this First Amendment to your  Employment Agreement (the “First
Amendment”), you and the Company
agree to amend your Employment  Agreement, dated January 31, 2013 (the “Agreement”),
by deleting Section 3.2 of  the Agreement in its entirety and replacing it with the following:

     “3.2 Bonus. Executive shall
be eligible to earn, for each fiscal year of the Company ending during Executive’s employment with the Company,
an annual discretionary cash bonus (an “Annual Bonus”) targeted at forty percent (40%) of Executive’s Base
Salary. If the Company determines, in it reasonable discretion, that Executive has engaged in any misconduct intended to
affect the payment of his/her Annual Bonus, or has otherwise engaged in any act or omission that would constitute Cause for
termination of employment, as defined by Section 1.2 of the Agreement, Executive will automatically and immediately forfeit
his/her entire Annual Bonus. If the Annual Bonus has already been paid to Executive, such Annual Bonus will be deemed
unearned, and the Company shall have the right to recover the entire amount of the Annual Bonus paid to Executive for the
calendar year(s) in which such misconduct or other act or omission constituting Cause occurred. Without limiting the
foregoing, any such misconduct or other act or omission constituting Cause will subject Executive to disciplinary action up
to and including termination of employment. In addition, any Annual Bonus paid to Executive for the calendar year(s) in which
such misconduct or other Cause occurred is subject to recoupment in accordance with The Dodd–Frank Wall Street Reform
and Consumer Protection Act and any implementing regulations,
any other clawback policy adopted by the Company and any compensation recovery policy otherwise required by applicable
laws, regulations or statutes. Recovery by the Company of an Annual Bonus in accordance with this Section shall not
constitute an event giving rise to a right by Executive to voluntarily terminate his/her employment for cause based on such
recovery by Company, nor shall it constitute “constructive termination”, or any similar term or circumstance under
the Agreement or any other plan or agreement with the Company.”

In consideration for your execution of this First Amendment, your
employment by the Company will continue on the terms and conditions set forth in the Agreement, as amended hereby. In
addition, Section 4.1(ii)(d) of the Agreement shall be amended by deleting the word “subsequent” and replacing it with
the phrase “other (i.e. granted prior or subsequently to the date hereof)”, such that the amended Section shall
read:

     “(d) the Option, along with any other
options (i.e. granted prior or subsequently to the date hereof) or other exercisable equity interest in the Company held by
Executive, shall remain outstanding and exercisable through the earlier of (i) the second (2nd) anniversary of the date of
termination or (ii) the original expiration date of the option or other equity interest.”

Please sign below to indicate your
agreement hereto.

Sincerely,

	GERON CORPORATION			
		 			
	By: 	/s/ John A.
      Scarlett		September 24, 2013	 
		     John A. Scarlett,
      M.D.		Date	
		     Chief Executive
      Officer			
					

	ACKNOWLEDGED AND AGREED TO:			
	 			 
	Melissa Behrs	 	 	
	Print Name			 
	 			
	/s/
      Melissa A. Kelly Behrs		September 24, 2013	
	SignatureEXHIBIT
10.2 

[Geron Letterhead]

September 24, 2013

Olivia K. Bloom

[Home Address]

     RE:   First Amendment to Employment
Agreement

Dear Olivia:

By this First Amendment to your  Employment Agreement (the “First
Amendment”), you and the Company
agree to amend your Employment  Agreement, dated December 7, 2012 (the “Agreement”),
by deleting Section 3.2 of  the Agreement in its entirety and replacing it with the following:

     “3.2 Bonus. Executive shall
be eligible to earn, for each fiscal year of the Company ending during Executive’s employment with the Company,
an annual discretionary cash bonus (an “Annual Bonus”) targeted at forty percent (40%) of Executive’s Base
Salary. If the Company determines, in it reasonable discretion, that Executive has engaged in any misconduct intended to
affect the payment of his/her Annual Bonus, or has otherwise engaged in any act or omission that would constitute Cause for
termination of employment, as defined by Section 1.2 of the Agreement, Executive will automatically and immediately forfeit
his/her entire Annual Bonus. If the Annual Bonus has already been paid to Executive, such Annual Bonus will be deemed
unearned, and the Company shall have the right to recover the entire amount of the Annual Bonus paid to Executive for the
calendar year(s) in which such misconduct or other act or omission constituting Cause occurred. Without limiting the
foregoing, any such misconduct or other act or omission constituting Cause will subject Executive to disciplinary action up
to and including termination of employment. In addition, any Annual Bonus paid to Executive for the calendar year(s) in which
such misconduct or other Cause occurred is subject to recoupment in accordance with The Dodd–Frank Wall Street Reform
and Consumer Protection Act and any implementing regulations,
any other clawback policy adopted by the Company and any compensation recovery policy otherwise required by applicable
laws, regulations or statutes. Recovery by the Company of an Annual Bonus in accordance with this Section shall not
constitute an event giving rise to a right by Executive to voluntarily terminate his/her employment for cause based on such
recovery by Company, nor shall it constitute “constructive termination”, or any similar term or circumstance under
the Agreement or any other plan or agreement with the Company.”

In consideration for your execution of this First Amendment, your
employment by the Company will continue on the terms and conditions set forth in the Agreement, as amended hereby. In
addition, Section 4.1(ii)(d) of the Agreement shall be amended by deleting the word “subsequent” and replacing it with
the phrase “other (i.e. granted prior or subsequently to the date hereof)”, such that the amended Section shall
read:

     “(d) the Option, along with any other
options (i.e. granted prior or subsequently to the date hereof) or other exercisable equity interest in the Company held by
Executive, shall remain outstanding and exercisable through the earlier of (i) the second (2nd) anniversary of the date of
termination or (ii) the original expiration date of the option or other equity interest.”

Please sign below to indicate your
agreement hereto.

Sincerely,

	GERON CORPORATION			
		 			
	By: 	/s/ John A.
      Scarlett		September 24, 2013	 
		     John A. Scarlett,
      M.D.		Date	
		     Chief Executive
      Officer			
					

	ACKNOWLEDGED AND AGREED TO:			
	 			 
	Olivia Bloom	 	 	
	Print Name			 
	 			
	/s/
      Olivia Bloom		September 24, 2013	
	SignatureEXHIBIT
10.3 

[Geron Letterhead]

September 24, 2013

Craig C. Parker

[Home Address]

     RE:   First Amendment to Employment
Agreement

Dear Craig:

By this First Amendment to your  Employment Agreement (the “First
Amendment”), you and the Company
agree to amend your Employment  Agreement, dated December 3, 2012 (the “Agreement”),
by deleting Section 3.2 of  the Agreement in its entirety and replacing it with the following:

     “3.2 Bonus. Executive shall
be eligible to earn, for each fiscal year of the Company ending during Executive’s employment with the Company,
an annual discretionary cash bonus (an “Annual Bonus”) targeted at forty percent (40%) of Executive’s Base
Salary. If the Company determines, in it reasonable discretion, that Executive has engaged in any misconduct intended to
affect the payment of his/her Annual Bonus, or has otherwise engaged in any act or omission that would constitute Cause for
termination of employment, as defined by Section 1.2 of the Agreement, Executive will automatically and immediately forfeit
his/her entire Annual Bonus. If the Annual Bonus has already been paid to Executive, such Annual Bonus will be deemed
unearned, and the Company shall have the right to recover the entire amount of the Annual Bonus paid to Executive for the
calendar year(s) in which such misconduct or other act or omission constituting Cause occurred. Without limiting the
foregoing, any such misconduct or other act or omission constituting Cause will subject Executive to disciplinary action up
to and including termination of employment. In addition, any Annual Bonus paid to Executive for the calendar year(s) in which
such misconduct or other Cause occurred is subject to recoupment in accordance with The Dodd–Frank Wall Street Reform
and Consumer Protection Act and any implementing regulations,
any other clawback policy adopted by the Company and any compensation recovery policy otherwise required by applicable
laws, regulations or statutes. Recovery by the Company of an Annual Bonus in accordance with this Section shall not
constitute an event giving rise to a right by Executive to voluntarily terminate his/her employment for cause based on such
recovery by Company, nor shall it constitute “constructive termination”, or any similar term or circumstance under
the Agreement or any other plan or agreement with the Company.”

In consideration for your execution of this First Amendment, your
employment by the Company will continue on the terms and conditions set forth in the Agreement, as amended hereby. In
addition, Section 4.1(ii)(d) of the Agreement shall be amended by deleting the word “subsequent” and replacing it with
the phrase “other (i.e. granted prior or subsequently to the date hereof)”, such that the amended Section shall
read:

     “(d) the Option, along with any other
options (i.e. granted prior or subsequently to the date hereof) or other exercisable equity interest in the Company held by
Executive, shall remain outstanding and exercisable through the earlier of (i) the second (2nd) anniversary of the date of
termination or (ii) the original expiration date of the option or other equity interest.”

Please sign below to indicate your
agreement hereto.

Sincerely,

	GERON CORPORATION			
		 			
	By: 	/s/ John A.
      Scarlett		September 24, 2013	 
		     John A. Scarlett,
      M.D.		Date	
		     Chief Executive
      Officer			
					

	ACKNOWLEDGED AND AGREED TO:			
	 			 
	Craig C. Parker	 	 	
	Print Name			 
	 			
	/s/
      Craig C. Parker		September 24, 2013	
	Signature

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