Symon won a bronze medal with the New Zealand coxed four at the 1984 Los Angeles Olympics and a silver medal in the coxless four at the 1986 Edinburgh Commonwealth Games. He also won a bronze with the New Zealand eight at Edinburgh.
The Christchurch rower won a national coxless fours title for the Avon club in 1986.
The bearded Symon still lives in Christchurch, where he owns his own clothing company, specialising in high country fashion. For a time Symon was involved with the Avon club as a coach.