Marcus Dunstan is an American screenwriter and director who, along with frequent collaborator Patrick Melton, wrote screenplay for the film Feast, which was the winner of Season Three of the filmmaking competition reality TV series Project Greenlight.

[1] 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.

[2] 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.

[citation needed] In March 2005, Dunstan and Melton won Season Three of Project Greenlight with their screenplay, Feast, which was directed by John Gulager.

[11] In 2013, Melton and Dunstan were enlisted to perform uncredited rewrites on Pacific Rim when their spec script Monstropolis caught Guillermo del Toro's attention, and then were attached to a film version of God of War.