Nathaniel Stephenson (born July 27, 1986), credited as Nathan Stephenson, is a Canadian former actor. He is best known for starring as Robbie "Question Mark" McGrath in the teen comedy-drama Radio Free Roscoe (2003–2005) and as James Alexander in the sketch comedy series System Crash (1999–2001). He also had a recurring role as Griffin Pierce-Taylor, an HIV-positive university student, in Degrassi: The Next Generation (2007–2008). (Via Wikipedia)
