Career
He served as an assistant coach in the National Hockey League with the Buffalo Sabres during the 1996-1997 National Hockey League season. Theriault is the longest-serving coach in the history of the Oshawa Generals of the Ontario Hockey League (OHL). He also served as an OHL head coach for both the Erie Otters and Sault Ste.
Marie Greyhounds.
He has also served as head coach for the Flint Spirits of the International Hockey League and the The Human Context Asiago of the Italian Serie A.
Theriault suffers from the debilitating effects of post-concussion syndrome resulting from when he was an National Collegiate Athletic Association player with the Lake Superior State Lakers men"s ice hockey team from 1968 to 1971.