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Marco Perella (born May 18, 1949) is an American character actor and author, who has played a variety of small roles in motion pictures shot in Texas. He is best known for his role in Boyhood (2014), playing an abusive alcoholic second husband, Professor Bill Welbrock, and for his bestselling book, Adventures of A No Name Actor (2001), a humorous autobiography recounting his struggles in the acting world. Wikipedia