For his performance in Stingers he was nominated for the 2001 Australian Film Institute Award for Best Performance by an Actor in a Guest Role in a Television Drama Series.
[1] After graduating from NIDA McMahon began his career in the stage play Kid Stakes for the Melbourne Theatre Company.
[2] He has toured internationally with Cloudstreet and played a main role in Last Man Standing.
[3] He played a soldier Darko Moey in Kokoda[4] and the lead character in Cactus.
[5] In 2012 he played in stage play Summer of the Seventeenth Doll, a sequel to Kid Stakes[6] and appeared as a regular in Miss Fisher's Murder Mysteries.