Ryan Wallace Zimmerman (born September 28, 1984) is an American professional baseball first baseman for the Washington Nationals of Major League Baseball (MLB). Zimmerman graduated from Kellam High School in Virginia Beach, Virginia and played college baseball at the University of Virginia. He has been a member of the Nationals since his debut on September 1, 2005. He is well known for his clutch hitting and walkoff hits. Formerly a third baseman, Zimmerman transitioned to first base in 2015.