Greg Sestero (born July 15, 1978) is a French-American model-turned-actor who is best known for playing Mark in The Room, which was riffed on by RiffTrax. The film has been dubbed as one of the best unintentional comedies of all time and Sestero has recently given James Franco the license to adapt the behind-the-scene autobiography of his work on the film known as "The Disaster Artist."