Cary Guffey (born May 10, 1972) is an American former child actor and financial planner. He is best known for his debut in the role of Barry Guiler in the film Close Encounters of the Third Kind (1977). Cary Guffey (born May 10, 1972) is an American former child actor and financial planner. He is best known for his debut in the role of Barry Guiler in the film Close Encounters of the Third Kind (1977).