John C. Martin, who led Gilead to greatness in developing a hugely profitable HIV drug franchise, has died.His death at the age of 70 was flagged by the company he built, though Gilead didn’t immediately say what the cause of death was. John C. Martin served as President and Chief Executive Officer of Gilead and a member of the Board of Directors since April 1996. Dr. Martin held several leadership positions in the antiviral chemistry division at Bristol-Myers Squibb Company and Syntex Corporation from 1978 until 1984. He previously served on the Centers for Disease Control/Health Resources and Services Administration's Advisory Committee on HIV and STD Prevention and Treatment. He is a member of the Presidential Advisory Council on HIV/AIDS, a member of the board of directors of the California Healthcare Institute and Gen-Probe Incorporated and a member of the board of trustees at the University of Chicago.