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Prior to Walking Fish, Dr. Williams founded and served as a director of Five Prime Therapeutics, Inc., a public biotechnology company, from January 2002 to January 2020, and served as its President and Chief Executive Officer from April 2011 to December 2017. Previously, Dr. Williams spent seven years at Chiron Corporation ("Chiron") a biopharmaceutical company, now known as Novartis Vaccines and Diagnostics, Inc., most recently as its Chief Scientific Officer. He also served on Chiron's board of directors from 1999 to 2001. Prior to joining Chiron, Dr. Williams was a professor of medicine at the University of California, San Francisco, and served as Director of the University's Cardiovascular Research Institution and Daiichi Research Center. Dr. Williams also has served on the faculties of Harvard Medical School and Massachusetts General Hospital and co-founded COR Therapeutics, Inc., a biotechnology company focused on cardiovascular disease. He is a member of the National Academy of Sciences and a fellow of the American Academy of Arts and Sciences. Dr. Williams was previously a member of the board of directors of COR Therapeutics, Inc., and Beckman Coulter, Inc., each of which was a public company during his service as a director. He currently serves on the Boards of Protagonist Therapeutics, Neoleukin Therapeutics, and Arcellx Therapeutics. Dr. Williams has also served as a venture partner of Quan Capital, LLP, a healthcare-focused venture capital firm, since October 2018. Dr. Williams received a B.S. from Rice University and an M.D. and a Ph.D. from Duke University.