Stern's alumni include former Chair of the Federal Reserve of the United States, Alan Greenspan; former CEO and current Chairman of Nasdaq, Robert Greifeld; Iceland's "first billionaire", Thor Bjorgolfsson; former CEO and Chairman of MetLife, John J. Creedon; former CEO of Viacom, Thomas E. Dooley; CFO of Pfizer, Alan Levin; President of DC Comics, Paul Levitz; and the founding financier of The Home Depot, Kenneth Langone.[53][54] Current and former CEOs of Fortune 500 companies including American Express, Berggruen Institute, Griffon Corporation, Wynn Resorts, the New York Stock Exchange, Lehman Brothers, Lord Abbett, Barnes & Noble, W. R. Berkley Corporation, McKinsey & Company, Chase Manhattan Bank, and CBS are also Stern alumni.[55][56][57]