POWER OF ATTORNEY

Know all men by these presents, that the undersigned hereby

constitutes and appoints Olivia Bloom and William Stempel, and

each of them, his true and lawful attorney-in-fact to:



(1) execute for and on behalf of the undersigned, in the

undersigned's capacity as a director of Geron Corporation

(the "Company"), Form 3s, Form 4s, and Form 5s in accordance

with Section 16(a) of the Securities Exchange Act of 1934, as

amended (the "1934 Act"), and the rules thereunder;



(2) do and perform any and all acts for and on behalf of the

undersigned which may be necessary or desirable to complete and

execute any such Form 3s, Form 4s, or Form 5s and timely file

such form with the United States Securities and Exchange Commission

and any other authority; and



(3) take any other action of any type whatsoever in connection

with the foregoing which, in the opinion of such attorney-in-fact,

may be of benefit to, in the best interest of, or legally required

by, the undersigned, it being understood that the documents executed

by such attorney-in-fact on behalf of the undersigned pursuant to

this Power of Attorney shall be in such form and shall contain

such terms and conditions as such attorney-in-fact may approve

in his or her discretion.



The undersigned hereby grants to each such attorney-in-fact

full power and authority to do and perform any and every act

and thing whatsoever requisite, necessary, or proper to be

done in the exercise of any of the rights and powers herein

granted, as fully to all intents and purposes as the undersigned

might or could do if personally present, with full power of

substitution or revocation, hereby ratifying and confirming

all that such attorney-in-fact, or his or her substitute or

substitutes, shall lawfully do or cause to be done by virtue

of this power of attorney and the rights and powers herein

granted.  The undersigned acknowledges that the foregoing

attorneys-in-fact, in serving in such capacity at the request

of the undersigned, are not assuming, nor is the Company

assuming, any of the undersigned's responsibilities to

comply with Section 16 of the 1934 Act.



This Power of Attorney shall remain in full force and effect

until the undersigned is no longer required to file Form 3s,

Form 4s, and Form 5s with respect to the undersigned's

holdings of and transactions in securities issued by the

Company, unless earlier revoked by the undersigned in a

signed writing delivered to the foregoing attorneys-in-fact.



IN WITNESS WHEREOF, the undersigned has caused this Power

of Attorney to be executed as of this 22nd day of August 2002.



/s/ Thomas B. Okarma

Signature



Thomas B. Okarma

Print Name