From Harvard Magazine, July-August 2014:

… the [Harvard] Faculty of Arts and Sciences disclosed a $17-million donation from the Pershing Square Foundation–founded by Bill (William A.) Ackman ‘88, M.B.A. '92, CEO of the Pershing Square Capital Management hedge fund, and Karen Ackman, M.L.A. '93–for a “foundation of human behavior” initiative grounded in behavioral economics and other disciplines. That gift provides for three new professorships and a research fund.