Pederson joined the cast of MADtv in season 8 (2002-03). At the beginning, he imitated celebrities such as Art Carney, Dick Clark, Mark Steines, and Woody Allen. Then at season 9, he created memorable characters such as ambiguously gay Abercrombie & Fitch model Carpenter, irritable 7 A.M. Condo Report host Clifford Bussley, Grandpa Finkel ("Feuding Parents"), and Aussie salesman Roland Backinson. He also became renowned for his offbeat impersonation of Clay Aiken, which feuled rumors if the American Idol runner-up was gay or not. He also repeated his impersonation of Woody Allen, as well as recurring impressions of Dave Foley in "Celebrity Quarters" sketches and Senator John Edwards during Season 10, which would be his last season.
Carpenter (Abercrombie & Fitch)
Clifford Bussley (7 A.M. Condo Report)
Grandpa Finkel ("Feuding Parents")
Roland Backison ("Verb Alert")
Andrew Ridgeley (Wham!)
David Hyde Pierce
Paul De Lisle (Smash Mouth)