Dr. Williams is co-founder, Chairman and CEO of Walking Fish Therapeutics, a private early stage cell therapy company, and is a Senior Advisor of Quan Capital. Dr Williams was previously Founder, Board Chairman and CEO (retired 2017) of Five Prime Therapeutics.. Prior to Five Prime, Dr. Williams was Chief Scientific Officer and Board member of Chiron Corporation, and Co-Founder of Cor Therapeutics, a publicly traded cardiovascular disease company. He served on the Boards of Cor Therapeutics, Chiron Corp, Beckman Coulter, Duke University, Rice University and the Berklee College of Music. Dr. Williams was a Professor of Medicine and Investigator of the Howard Hughes Medical Institute at the University of California, San Francisco. He trained in Internal Medicine and Cardiology at the Massachusetts General Hospital, where he served on the faculty and practiced cardiology. He is a member of the US National Academy of Sciences and a fellow of the American Academy of Arts and Sciences. He received an M.D. and a Ph.D. from Duke University.