Although he was only 5-5 (165 cm.), Les MacDonald started out as a hoopster for the Cotas Basketball team. He also started rowing and twice made the Canadian Olympic team in that sport. He also finished third in the 1930 British Empire Games eights competition. His business career was spent entirely with Ontario Hydro. During World War II, MacDonald served in Great Britain where he worked primarily defusing bombs dropped by the German Air Force. In the 1960s he became head coach for the Leander Boat Club in Hamilton. In his later life he was a competitive lawn bowler.
Date of birth is uncertain. Commonwealth Games data also has a DOB of 5 October 1907, but multiple sources confirm the DOB listed above.