Mahoney, who grew up in Cochrane, Alberta, was a four-year starter and an all-Canadian at wide receiver at Simon Fraser University. In 2003, he set a Canada West playoff record when he caught 11 passes for 294 yards and five touchdowns against Regina.[2]
He was selected in the 6th Round (48th Overall) in the 2004 CFL draft by the Toronto Argonauts.[3] Mahoney was signed by the Argonauts on May 14, 2004, but was released June 10.[4]
After spending some time on the Calgary Stampeders practice roster, Mahoney began his scouting career in 2007 as an intern in the team's personnel department.[2] Other roles he has held with Calgary include director of Canadian scouting, scout and assistant director of football operations.[2] In 2019, he became director of player personnel, and on December 12, 2022, added the title of assistant general manager.[1]
During his time with the team, the Stampeders have won 3 Grey Cup championships: 2008, 2014, and 2018.