Out of the mare Swanky, whose damsire Mahmoud won the 1936 Epsom Derby, he was sired by Whitney's Phalanx, the 1947 Belmont Stakes winner and American Champion Three-Year-Old Male Horse.
Triple Crown series, he made a powerful stretch run to finish a neck second to Needles with Preakness winner Fabius in third.
[2] In September 1956, Career Boy showed an affinity for racing on the grass with a one-length win under jockey Sam Boulmetis in the United Nations Handicap at Atlantic City Racecourse.
Entered with stablemate Fisherman and with Eddie Arcaro riding, Career Boy finished fourth in the 1956 Arc to Ribot.
Retired to stud duty, Career Boy stood in the United States until age thirteen when he was sent to a breeding operation in Argentina.