POWER OF ATTORNEY
The undersigned hereby constitutes and appoints each of Tara J. Gabbai, Susan E. Grant, Lori P. Hernando, Margaret M. Madden, Madelyn D. Purcell and Shehzad Siddiqui as the undersigned’s true and lawful attorney-in-fact and agent, and grants each of them full power to act on behalf of the undersigned and in the undersigned’s name, place and stead, in any and all capacities, for the purpose of completing and signing, on behalf of the undersigned,
with regard to the undersigned's ownership of or transactions in securities of Pfizer Inc., including, without limitation, the power to complete and sign any and all amendments to such forms and documents, if any, and to file such forms and documents and amendments thereto with the Securities and Exchange Commission, and to do and perform each and every act and thing requisite or necessary to be done in connection with such forms and documents and amendments thereto, as fully and to all intents and purposes as the undersigned might or could do in person.
The authority of Tara J. Gabbai, Susan E. Grant, Lori P. Hernando, Margaret M. Madden, Madelyn D. Purcell and Shehzad Siddiqui under this Power of Attorney shall continue until the undersigned is no longer required to file Form 3, Form 4, Form 5 or Form 144 with regard to the undersigned's ownership of or transactions in securities of Pfizer Inc., unless earlier revoked in writing. The undersigned acknowledges that Tara J. Gabbai, Susan E. Grant, Lori P. Hernando, Margaret M. Madden, Madelyn D. Purcell and Shehzad Siddiqui are not assuming any of the undersigned's responsibilities to comply with Rule 144 under the Securities Act or Section 16 of the Exchange Act.
Signature: /s/Susan Hockfield
Susan Hockfield
Date: February 27, 2020