[1] Drafted by the Montreal Canadiens in 1979, Wamsley played with the Nova Scotia Voyageurs before being called up to the big team.

He spent three successful seasons in Montreal before being shipped to St. Louis in exchange for the draft picks which the Canadiens would ultimately use to select future players Shayne Corson and Stéphane Richer.

Wamsley was traded to the Calgary Flames with Rob Ramage for Brett Hull and would be a part of their Stanley Cup team in 1989.

[3][4] Wamsley joined the Toronto Maple Leafs' organization as a goaltending consultant immediately after retiring following the 1992–93 season.

He would spend six seasons as a member of the organization, becoming an assistant coach under Pat Burns from 1994–96, and then serving as a pro and amateur scout until 1999.