in full Reginald Martinez Jackson
born May 18, 1946, Wyncote, Pa., U.S.
U.S. baseball player.
Jackson excelled in track, football, and baseball in high school. In the major leagues, batting and throwing left-handed and playing outfield, he helped three teams (Oakland Athletics, 196875; New York Yankees, 197681; California Angels, 198287) win five World Series, six pennant races, and 10 divisional play-offs. Noted for his home-run hitting, he was nicknamed "Mr. October" for his reliable prowess in play-off and World Series games. He hit a career total of 563 home runs, placing him in the top ten of all-time home-run hitters.