Greg Sestero
Gregory Greg Sestero is an actor, model, and author who holds both American and French citizenship. He is best known for his role as Mark in the 2003 cult film The Room, and for writing the critically acclaimed best selling 2013 book The Disaster Artist about his life and experience making The Room.
Sestero was born in Walnut Creek, California. His mother is of French and Sicilian descent. At the age of 12, he wrote a sequel to the 1990 film Home Alone with a leading role for himself. He submitted the screenplay to Hughes Productions and received a commendatory letter from filmmaker John Hughes. During his junior year of high school, Sestero began modelling, working in locations such as Milan and Paris for designers such as Giorgio Armani and Gianfranco Ferre. He returned to the United States to focus on acting, enrolling in the American Conservatory Theatre in San Francisco, California. He eventually signed with Hollywood agent Iris Burton, which prompted his eventual move to Los Angeles, California.
Source: Wikipedia