FOSTER CITY, Calif.--(BUSINESS WIRE)--Dec. 13, 2005--Gilead Sciences, Inc. (Nasdaq:GILD) announced today that John W. Madigan has been appointed to the company’s Board of Directors, bringing the number of Directors to 10. Mr. Madigan, 68, is the retired chairman and chief executive officer of Tribune Company. He served as chairman from 1996 through December 2003 and held the position of chief executive officer from May 1996 until December 2002. Tribune Company is a media industry leader with operations in major markets throughout the United States. Prior to his tenure at the Tribune, Mr. Madigan was an investment banker with Salomon Brothers and Paine, Webber, Jackson & Curtis. Prior to that he was an audit manager with Arthur Andersen & Co.