In the last of a four-part series, film-maker Alex Cox investigates the secret lives of some of cinema's greatest directors, looking at the men behind the movies. Orson Welles. At the age of just 25 Orson Welles made his stunning directorial debut with Citizen Kane , pushing existing film-making techniques as far as they could go. Alex Cox looks at Welles's maverick nature and why he failed to build on his early success. Producer Colin Hughes