|Date of birth||c. 1927|
|Place of birth||Sarnia, Ontario|
|College||Sarnia Collegiate Institute and Technical School|
|1950–51||Winnipeg Blue Bombers|
|Career highlights and awards|
|Awards||1949 - Imperial Oil Trophy|
Coming straight from high school, Knowles played for his hometown Sarnia Imperials from 1946 to 1950, with his finest season being 1949, when he was an all-star and won the Imperial Oil Trophy as OFRU most valuable player. He later played two seasons with the Winnipeg Blue Bombers, returned to Sarnia for a season, and finished his football career playing a game for the 1954 inaugural BC Lions team.
In 1990 he was elected to the Sarnia Lambton Sports Hall of Fame.