Antony Ressler

Antony "Tony" Ressler cofounded private equity giant Apollo Management with brother-in-law and fellow billionaire Leon Black in 1990.Like Black, he had previously worked at Wall Street firm Drexel Burnham Lambert, where he was known for his role in the bond department. In 1997, he cofounded Ares Management, a private equity and investment firm. He stepped down as CEO in December 2017 and became executive chairman.Ressler owns a minority stake in the Milwaukee Brewers baseball team and is the majority owner of the NBA's Atlanta Hawks.Ressler has donated millions to the Los Angeles County Museum of Art and Cedars-Sinai Medical Center, and sits on the boards of both.