McMahon began his coaching career at his alma mater, Eastern Illinois, in 1982. From 1983–1984, he coached at the University of Minnesota[3] and at the University of North Alabama from 1985–1987. He then moved on to two one-year coaching stints at Southern Illinois in 1988 and Valdosta State in 1989.
From 1990–1991, McMahon was the tight end, offensive tackle and special teams coach for the University of Nevada at Las Vegas. McMahon then spent 13 seasons (1992–2004) as an assistant coach at the University of Illinois as a wide receiver and tight end/special teams coach.[3] He then spent one year as tight end/special teams coach at East Carolina in 2005.
McMahon moved to the NFL as the assistant special teams coach for the New Orleans Saints from 2006–2007 and special teams coordinator from 2008–2016.[4]
In 2017, McMahon became the special teams consultant at LSU.[5] On January 12, 2018, he was named special teams coordinator at LSU.[6]
McMahon retired from coaching following the 2021 season.[7]
On March 17, 2022, it was announced that McMahon was hired as the Special teams coordinator/Tight ends coach of the Houston Gamblers of the United States Football League.[8]
On September 13, 2022, McMahon was announced as Special teams coordinator of the Houston Roughnecks of the XFL[9]
Following the Roughnecks season, McMahon returned to college football, joining Willie Fritz's Tulane Green Wave football staff as the special teams coordinator in May 2023.[10]
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