After a long amateur career, (with the Oshawa Green Gaels and the Brooklin Redmen of the Ontario Junior and Senior Leagues respectively, and Ithaca College where he made All-American), and appearances with the Canadian National Field team at several world championships, Keenan began professional play in 1992 with the Buffalo Bandits, where he won the 1992 Rookie of the Year Award.
After a five-year break, he played six games with the Toronto Rock in 1999, before becoming an assistant coach under Les Bartley.
[1] However, less than four months later, after a 2–4 start, both Keenan and Comeau were fired by the Rock,[2] replaced by Terry Sanderson.
In July 2005, Keenan was named head coach and general manager of the then-unnamed Portland expansion franchise.
[5] Keenan's wife, Wendy, was the sister of Hockey Hall of Famer, Joe Nieuwendyk.