An American actor, playwright, and novelist, he is renowned for his intense character portrayals and thought-provoking monologues. He gained prominence with his Obie Award-winning play "Talk Radio," later adapted into a film by Oliver Stone. His work often delves into themes of societal alienation and media influence. He has appeared in films like "Under Siege 2" and TV series including "Law & Order: Criminal Intent." His multifaceted career also includes acclaimed novels and solo performances.