A native of Leicester England, Hearth was one of the founding members of the St. Catharines Cycling Club and spent 21 years coaching with the club.
During his stint with the St. Catharines club, Hearth coached Steve Bauer, Karen Strong and Gord Singleton to nine of the 13 medals won by Canada at the world championships and Olympics from 1984 to 1994.
These three athletes were among 10 cyclists from the club to make the national team. Later, he enjoyed coaching success with the Fonthill Cycling Club.
From 1992 to 1994, Hearth served as president of the Ontario Cycling Association. He was also the director of Canadian Cycling Association for 17 years, a national junior coach, a national track and road coach and founded the Garden City Wheelers, Fenwick Cycling Club and Fonthill Cycling Club.