Martin Scorsese has directed Robert De Niro in 9 feature films: Mean Streets (1973), Taxi Driver (1976), New York, New York (1977), Raging Bull (1980), The King of Comedy (1983), Once Upon a Time in America (1984 segment only), The Untouchables (1987 - deleted scene), Casino (1995), and The Irishman (2019). This is one of the most iconic director-actor collaborations in cinema history.