Marshall played three years, from 1982 to 1984, in the CFL with the Eskimos, winning a Grey Cup in the 70th incarnation of the Canadian football championship game.
Marshall joined the Hamilton Tiger-Cats to start the 2004 CFL season, replacing the legendary Ron Lancaster as head coach.
2006 started off very rocky for Marshall, going into the current campaign with four straight losses, putting his very short coaching career in jeopardy.
The situation was finally put on ice as general manager Rob Katz and owner Bob Young made the tough decision to end his tenure with the club, making Lancaster interim head coach once more.
In August 2006, Marshall returned to Western Ontario as offensive co-ordinator, which generated a large amount of coverage due to his prominence as a CFL coach.
He made his first appearance as a head coach in the Vanier Cup game in 2008, but lost to the perennial power house Laval Rouge et Or.
[5] In 2021, Marshall led the Mustangs to the eighth Vanier Cup championship in program history and his second as head coach.