Joel Greenblatt (born December 13, 1957) is an American academic, hedge fund manager, investor, and writer. He is a value investor, and adjunct professor at the Columbia University Graduate School of Business. He is the former chairman of the board of Alliant Techsystems and founder of the New York Securities Auction Corporation. He is also a director at Pzena Investment Management, a high-end value firm
432 Investors Online.