In 1973, early in their careers, Martin Scorsese and Robert De Niro collaborated for the first time. Over the next few decades, they worked together on seven more movies, many of which brought them both acclaim and awards. And while successful director and actor pairings have occurred throughout the history of film, few have fashioned so many works of enduring value as these two artists. In little more than two decades, Scorsese and De Niro produced...