Harold Kefauver Keller (July 7, 1927 – June 5, 2012) was an American professional baseball player and executive.During an eight-season pro playing career, Keller appeared as a catcher in 25 games for the Washington Senators of Major League Baseball between 1949 and 1952. Keller, a left-handed batter, stood 6 feet 1 inch (1.85 m) tall and weighed 200 pounds (91 kg).