Career Hearn competed in three Summer Olympics, earning his best finish of ninth in the C-1 event in Atlanta in 1996.
Achievements He won seven medals in the C-1 event at the International Coach Federation Canoe Slalom World Championships with two golds (1985, 1995) and five silvers (1979, 1981, 1983, 1987, 1989). He also won six consecutive world championship gold medals in the C-1 team event (1979-1989).