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Greg Sestero is an American actor, filmmaker, model and author, best known for his role as Mark in the 2003 cult film The Room, as well as for his well-received memoir The Disaster Artist, detailing his experiences making The Room, which itself was later adapted into a 2017 film. He also appeared in a minor role as James in the 2020 Netflix miniseries The Haunting of Bly Manor. Wikipedia