Martin Scorsese is one of the greatest living filmmakers, and many of his movies star longtime collaborator Robert De Niro. Scorsese and De Niro first worked together on the seminal 1973 gangster film Mean Streets, and that laid the foundation not only for the director's career and style of filmmaking but his casting going forward. As De Niro proved himself to be an influential powerhouse of dramatic acting who transforms himself for every role, he was the perfect fit for Scorsese's emotionally resonant character studies, regardless of their focus.

De Niro is a two-time Academy Award winner, earning the second under the direction of Scorsese. Meanwhile, Scorsese might not have a Palme d'Or if it wasn't for De Niro either. Killers of the Flower Moon. But Scorsese and De Niro's partnership goes back 50 years, and they've worked on some of cinema's most significant movies together.

RELATED: Everything We Know About Killers Of The Flower Moon

9 New York, New York (1977)

Robert De Niro plays a saxophone in New York, New York

New York, New York is an outlier in Martin Scorsese's filmography. As the director had two classic crime movies already under his belt, that's what was expected of him, which is why this romantic musical drama about jazz musicians didn't initially go down well with critics (via Taxi Driver.

8 Casino (1995)

Robert De Niro as Sam 'Ace' Rothstein standing in a casino in Casino

Martin Scorsese almost has an "if it ain't broke, don't fix it" approach to Goodfellas made Casino possible, it's hardly as if the formula was wearing thin, as the two actors playing unpredictably violent gangsters and causing havoc is always endlessly entertaining.

7 Mean Streets (1973)

Robert De Niro grins in a bar in Mean Streets

Mean Streets is what introduced Martin Scorsese and Robert De Niro as collaborators, and it's the foundation of the director's career. Though its release was sandwiched between The Godfather Part II, a fast-paced and loose mob movie was refreshing at the time. And while the filmmaker had directed a couple of low-budget movies beforehand, it was the scrappy 1973 gangster movie that established his frenetic style, the quintessential New York setting, and of course, Martin Scorsese's constant use of freeze frames. De Niro's raw energy in the movie matches Scorsese's style, too, and they clearly knew they had something to prove in the filmmaking world.

6 Cape Fear (1991)

Robert De Niro laughing in a movie theater in Cape Fear

While other movies Martin Scorsese and Robert De Niro made together have a bigger footprint on the cinema landscape and a more important legacy, Goodfellas (though Cape Fear was parodied on The Simpsons), Scorsese's Cape Fear remake was surprisingly the biggest box office hit the duo had together, grossing $182 million worldwide (via Box Office Mojo).

RELATED: Why Cape Fear Is Secretly Martin Scorsese's Best Horror Movie

5 The Irishman (2019)

De-aged Robert De Niro on the phone in The Irishman

Scorsese used CGI to seamlessly de-age the actors.

4 The King of Comedy (1982)

Robert De Niro as Rupert Pupkin performing in The King of Comedy

Martin Scorsese's comedies never perform well at the box office despite them being among his best movies. inspired Joker's best scenes.

3 Raging Bull (1980)

Robert De Niro as Jake LaMotta with a bandaged nose in Raging Bull

Robert De Niro transformed himself to play LaMotta.

2 Taxi Driver (1976)

Robert De Niro as Travis Bickle pointing a gun with no shirt on in Taxi Driver

Martin Scorsese was returning the favor when Robert De Niro won an Oscar for Raging Bull, as the filmmaker had won the Palme d'Or at Cannes for Taxi Driver four years earlier, and he wouldn't have done it without his lead actor. Taxi Driver follows Travis Bickle (De Niro), a New York cabbie who becomes obsessed with saving an underage sex worker. While Batman is cinema's most famous vigilante, Travis Bickle is the most realistic, and Taxi Driver does a great job of depicting the true horrors of violence. The movie showcases how great De Niro is at ad-libbing, too, as he improvised the famous "you talkin' to me" scene.

RELATED: Taxi Driver Ending Explained: What’s Real & What’s In Travis’ Head?

1 Goodfellas (1990)

Jimmy and Henry in a diner in Goodfellas

Goodfellas and The Godfather are two sides of the same coin. They're the greatest movies about the Italian mafia, but where The Godfather is slow-paced with almost no camera movements, Goodfellas is full of energy with endless tracking shots, and that's why it's so beloved. It came at a time when Godfather-influenced movies were wearing thin, and the frantic style was a rejuvenating take on the gangster genre. Depicting the true story of gangster and snitch Henry Hill (Ray Liotta), Goodfellas is the peak of Martin Scorsese and Robert De Niro's shared filmography, and it even sits at number 17 on IMDb's list of the best movies of all time.

MORE: Why Marlon Brando Didn't Want Martin Scorsese To Make Goodfellas