AUTHORIZATION LETTER




July 30, 2008

Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C. 20549
Attn: Filing Desk


To Whom It May Concern:

By means of this letter I revoke all prior Powers of Attorney
authorizing certain individuals to sign on my behalf all forms
required under Section 16(a) of the Securities Exchange Act of
1934, as amended (the "Exchange Act"), relating to transactions
involving the stock or derivative securities of Gilead Sciences,
Inc. (the "Company") and I hereby authorize John F. Milligan,
Gregg H. Alton, Robin L. Washington and Kristen M. Metza, or any
of them individually, to sign on my behalf all forms required
under Section 16(a) of the Exchange Act relating to transactions
involving the stock or derivative securities of the Company. Any
of these individuals is accordingly authorized to sign any Form
3, Form 4, Form 5 or amendment thereto which I am required to
file with the same effect as if I had signed them myself.

This authorization shall remain in effect until revoked in
writing by me.


Yours truly,



Carla A. Hills
















Power of Attorney

	Know all by these presents, that the undersigned hereby
constitutes and appoints
each of John F. Milligan, Gregg H. Alton, Robin L. Washington and
Kristen M. Metza, signing individually, the undersigned's true
and lawful attorneys-in-fact and agents to:

execute for and on behalf of the undersigned, an officer or
director  of
Gilead Sciences, Inc. (the "Company"), Forms 3, 4 and 5 in
accordance with Section 16(a) of the Securities Exchange Act of
1934, as amended (the "Exchange Act") and the rules there under;

do and perform any and all acts for and on behalf of the
undersigned
that may be necessary or desirable to complete and execute such
Form 3, 4 or 5, complete and execute and amendment or amendments
thereto, and timely file such forms or amendments with United
States Securities and Exchange Commission and any stock exchange
or similar authority; and

take any other action of any nature whatsoever in connection with
the
foregoing which, in the opinion of such attorney-in-fact, may be
of benefit, 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
such attorney-in-fact's 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, fully to
all intents and purpose 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 such attorney-in-fact's 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 Exchange Act.

	This Power of Attorney shall remain in full force and
effect until the earliest to occur of (a) the undersigned is no
longer required to file Forms 3, 4 and 5 with respect to the
undersigned's holdings of and transactions in securities issued
by the Company, (b) revocation by the undersigned in a signed
writing delivered to the foregoing attorney's-in-fact or (c) as
to any attorney-in-fact individually, until such attorney-in-fact
shall no longer be employed by the Company.

	IN WITNESS WHEREOF, the undersigned has caused this Power
of Attorney to be executed as of this 30th day of July, 2008.



						Carla A. Hills