Marcus Dunstan (born April 14, 1978) is an American screenwriter and director who, along with Patrick Melton, wrote screenplay for the film Feast, which was the winner of Season Three of the filmmaking competition reality TV series Project Greenlight. Dunstan has since written the screenplays for Feast, Feast 2: Sloppy Seconds, Feast III: The Happy Finish, The Collector, Saw IV, Saw V, Saw VI, and Saw 3D, and in some cases, making cameo appearances in those films as well. Dunstan was born in Macomb, Illinois. He spent his formative years working in movie theaters and studying film at the University of Iowa. While in college Dunstan experimented with 16mm film often using himself as the guinea pig in poorly executed stunts that left him dragging behind a car, the target of flying knives, and thrice being set on fire. He holds the record for spilling the most fake blood ever in a student film. Since moving to Los Angeles in 1999, Dunstan toiled in several odd jobs including a retirement home, an Optometry clinic, and a video store while spending his nights writing on a computer borrowed from fellow screenwriter, Patrick Melton.

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