Martin SHEEN is an American actor best known for his role as President Josiah Bartlet in the television series The West Wing. He has also appeared in many other films and television shows over the course of his career.' Martin SHEEN is an American actor best known for his role as President Josiah Bartlet in the television series The West Wing. He has been acting since the 1960s and has appeared in many films and television shows, including Apocalypse Now, The Departed, and Grace and Frankie. He has won numerous awards for his work, including a Golden Globe Award for Best Actor in a Television Series for his role in The West Wing.