Buyout titan grew up wealthy in Greenwich, Conn.; played hockey at Yale. With brother, founded private equity firm Forstmann Little 1978. Critic of junk bonds made hundreds of millions buying, growing, flipping Gulfstream Aerospace and General Instruments. In 2004 bought talent agency IMG for $750 million. Company's clients include golfer Tiger Woods, model Gisele BYndchen. Owns 24 Hour Fitness. Linked to Top Chef cohost Padma Lakshmi. Mr. Forstmann never married. He is survived by Siya and Everest, and his siblings: J. Anthony Forstmann, John Forstmann, Marina Forstmann Day and Elissa Forstmann Moran.