John Wallace’s career as a rower for the Canadian national team was often overshadowed by his then-wife’s, Silken Laumann, who was one of the best female Canadian rowers of the late 1980s and early 1990s. Wallace got his start in rowing at Hamilton, Ontario’s Leander Boat Club in 1983, inspired to join the sport by compatriot Mel LaForme. His first major international tournament was the 1985 World Championships, where he placed tenth in the eights, but he improved his performance to seventh in the coxed fours and fifth in the eights at the 1986 and 1987 editions respectively. He also reached the finals of the coxed fours at the 1986 Commonwealth Games, but did not medal. After finishing sixth in the eights at the 1988 Summer Olympics, he took a year off from major international tournaments, but came back strong at the 1990 World Championships by winning silver in the eights alongside Darren Barber, Andy Crosby, Robert Marland, Terry Paul, Derek Porter, Michael Rascher, Bruce Robertson, and Brian Saunderson. He repeated the feat in 1991, with Don Telfer substituting for Saunderson, and then went on to the 1992 Summer Olympics, where the crew, with Michael Forgeron in place of Tefler, won the gold medal and set an Olympic record. Wallace retired shortly after the Games and later took up the triathlon to remain athletically active.