With the Notre Dame Fighting Irish football team, Mahan played as center, tackle, and guard.

[1] Mahan played under head coach Bob Davie from 1999 to 2001 and Tyrone Willingham in 2002.

[3] In his rookie year, Mahan wore jersey number 78 and made most of his appearances on special teams.

[6] Throughout the next three seasons, Mahan played in every single game for the Buccaneers and in 2005 was part of the offensive line that helped Cadillac Williams to the NFL Rookie of the Year.

[1] After a disappointing year at center for the Steelers, and the signing of free agent Justin Hartwig, on September 2, 2008, Mahan was traded back to the Buccaneers for a 7th round 2009 NFL draft pick.