James "Jamie" Dimon (/ˈdaɪmən/; born March 13, 1956) is an American business executive. He is chairman, president and chief executive officer of JPMorgan Chase, largest of the Big Four American banks, and previously served on the Board of Directors of the Federal Reserve Bank of New York. Dimon was named to Time magazine's 2006, 2008, 2009, and 2011 lists of the world's 100 most influential people.