There's little debate that Robert De Niro is one of the greatest, if not the greatest, screen actors of his generation, perhaps of all time. His work, particularly in the first 20 years of his career, is unparalleled. Mean Streets, The Godfather Part II, Taxi Driver, The Deer Hunter, and Raging Bull all dazzled moviegoers and critics alike, displaying a talent the likes of which had rarely - if ever - been seen. De Niro become known for his deep involvement in his characters, assuming that role completely into his own life, resulting in extraordinary, chameleonic performances.