Aaron John Boone (born March 9, 1973) is an American professional baseball manager and former infielder who is the manager of the New York Yankees of Major League Baseball (MLB). He previously played in MLB for 13 seasons from 1997 to 2009. As a player, Boone is most recognized for his 2003 campaign with the Yankees, during which he hit the winning walk-off home run of the 2003 American League Championship Series.