Mason is a graduate of Studio 58. He was last seen as Ev in SLIME (The Only Animal). Other notable credits include Li in Satellite(s) (Solo Collective), for which he received a Jessie Richardson nomination for Outstanding Performance by an Actor—Small Theatre; Manuel in Refugee Hotel (Studio 58); part of the chorus in East Van Panto: Little Red Riding Hood; and Joe Pitt in Angels in America: Part One (Studio 58).