Initially a proverbial 98-pound weakling, bullied at school and unable to impress the girl of his dreams, Mary James, the 5 ft 1 in (1.55 m) Al Pratt was trained to fighting condition by ex-boxer Joe Morgan (the same man who trained Pratt's fellow mystery men Wildcat and the Guardian). Pratt soon became a founding member of the Justice Society of America, appearing in the team's various stories during their original Golden Age appearances. In All Star Comics #3 (Winter 1940), the Atom describes himself to his fellow JSAers as "Al Pratt, a quiet sophomore at Calvin College". He later became a founding and active member of the All-Star Squadron. During World War II, Pratt served as a tank driver for the United States Army.