Stephen A. Sherwin

DR. STEPHEN A. SHERWIN is Chairman of the Board and Chief Executive
Officer of Cell Genesys, Inc. He joined Cell Genesys in March 1990. Dr.
Sherwin has served as Chief Executive Officer since our inception and,
in March 1994, was elected to the additional position of Chairman of the
Board of Directors. Dr. Sherwin also served as President until July
2001, at which time Dr. Vallner was appointed President. From 1983 to
1990, Dr. Sherwin held various positions at Genentech, Inc., a
biotechnology company, most recently as Vice President of Clinical
Research. Prior to 1983, Dr. Sherwin was on the staff of the National
Cancer Institute. Dr. Sherwin currently serves as the Chairman of the
Board for Ceregene, Inc., a majority-owned subsidiary of Cell Genesys
and a company that he co-founded in 2001. He was also a co-founder of
Abgenix, Inc., a former subsidiary of Cell Genesys. Dr. Sherwin
currently serves as member of the Board of Directors for Neurocrine
Biosciences, Inc., and Rigel Pharmaceuticals, Inc., and also serves as a
Board member of the Biotechnology Industry Organization. He holds a BA
in Biology from Yale University and an MD from Harvard Medical School
and is Board Certified in Internal Medicine and Medical Oncology.