A native of Canada, Armstrong enrolled at the University of Texas after competing for Canada in the 1976 Olympics. After two successful season with the Longhorns and another Olympic team selection in 1980, he began his coaching career. He coached the Canadian national team at the 1984 Olympics and eventually made his way back to Texas to serve as age group coach for Longhorn Aquatics. After two years coaching alongside Ron O’Brien in Boca Raton, he became head coach of the Woodlands dive team in 1989. Under Armstrong’s tutelage over more than 25 years, the junior and senior teams have grown substantially and produced numerous age group and senior national and international champions. Armstrong was selected as head coach for the 2000 Olympics in Sydney, Australia, where Woodlands diver and TSDHOF inductee Laura Wilkinson won the Olympic gold medal in the women’s 10-meter platform event. This was the first Olympic diving gold medal for a U.S. woman in that event since 1964. He has been a member of every U.S. Olympic coaching staff since 2000. He is married to former University of Texas diving great Patty Overmyer. They have three children: Dylan, Katie and Tyce.