In 1954, Colman returned to his hometown of London, Ontario, signing on as player-manager with the London Majors, then owned by team general manager Clare Van Horne. In 1955, Colman purchased the Majors in 1956 from Van Horne and co-founded the Eager Beaver Baseball Association with London sportsman Gordon Berryhill and Al Marshall. Colman's Majors won the Intercounty title in 1956.
