High Quality Content by WIKIPEDIA articles! Donald Eugene (Gene) Conley (born November 10, 1930) is a former Major League Baseball pitcher who played eleven seasons from 1952 to 1963 for four different teams. Conley also played forward in the 1952-1953 season and from 1958 to 1964 for two teams in the National Basketball Association. He is best known for being the only person to win championships in two of the four major American sports, one with the Milwaukee Braves in the 1957 World Series and three Boston Celtics championships from 1959-61.