During his tenure in Winnipeg he supplied players for head coaches Cal Murphy and Mike Riley.
[3] After five years in Washington, Mack spent four seasons with the expansion Carolina Panthers as assistant general manager, before becoming the interim director of player personnel for the Cleveland Browns.
He helped build another expansion team in 2001 as the director of football operations for the XFL's New York/New Jersey Hitmen.
Even with a Grey Cup appearance in 2011, the Blue Bombers struggled during Mack's tenure, posting a 21–39 record.
[6] Following the dismissal of general manager Kavis Reed on July 14, 2019, the Alouettes expanded Mack's role alongside head coach Khari Jones and director of football operations Patrick Donovan to fill the responsibilities left by the vacant general manager position.