In 1939, he won the United States and Canadian doubles amateur rowing championships, teaming with Albert Riley.
Dubois won the U.S. and Canadian amateur titles in 1941 and was awarded the Lou Marsh Trophy as Canada's top athlete of the year.
In 1948 he won the Canadian Association of Amateur Oarsman (CAAO) qualifying singles race for the Olympics.
[2] Dubois was a long-time member and coach at the Winnipeg Rowing Club, where he was made honorary president in 1978.
Outside of sports, Dubois graduated with a bachelor's degree in architecture from the University of Manitoba and became a professional architect.