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Harold Kefauver Keller (July 7, 1927 – June 5, 2012) was an American professional baseball player and executive who served as the fourth general manager in the history of the Seattle Mariners of Major League Baseball (1984–85). Born on a farm in Middletown, Maryland, he graduated from the University of Maryland with a degree in economics and served in the United States Army during World War II. Keller's older brother, Charlie, was an All-Star left fielder with the New York Yankees.