Bill Ackman
Bill Ackman in 2024.© Jared Siskin—Patrick McMullan/Getty ImagesWilliam Albert “Bill” Ackman (born May 11, 1966, Chappaqua, New York, U.S.), is an American billionaire hedge fund manager. Ackman is the founder and chief executive officer (CEO) of Pershing Square Capital Management. Throughout his career, Ackman had a reputation as an activist investor—a shareholder who acquires significant stakes in companies to...