Bill Ackman Pershing Square Capital Management

Bill Ackman is the founder and CEO of Pershing Square Capital Management, a New York–based hedge fund. He employs an activist investing approach, seeking to influence the management and direction of the publicly traded companies in which he invests. Frequently in the public eye, Ackman has been noted for both high-profile successes and controversies, such as his well-known short position in Herbalife.