Bill Jackman
William "Cannonball" Jackman was an American baseball pitcher in the Negro Leagues. He played from 1925 to 1942 with several teams., including a spot on the otherwise all-white East Douglas team in Massachusetts's amateur Blackstone Valley League in 1929, a squad which also featured 18-year-old newcomer Hank Greenberg.
At age 55, Jackman received votes listing him on the 1952 Pittsburgh Courier player-voted poll of the Negro Leagues' best players ever.
