Question: What roles did Gregory Nava and Marco Bellocchio both perform?

Context paragraphs:
El Norte (film): El Norte is a 1983 British-American low-budget independent drama film, directed by Gregory Nava.  The screenplay was written by Gregory Nava and Anna Thomas, based on Nava's story.  The movie was first presented at the Telluride Film Festival in 1983, and its wide release was in January 1984.

The Confessions of Amans (film): The Confessions of Amans is a 1977 American 16mm drama film directed by Gregory Nava and written by Nava and his then newly wed wife Anna Thomas.

A Time of Destiny: A Time of Destiny is a 1988 American drama film directed by Gregory Nava and written by Nava and Anna Thomas.  The story is based on the opera "La forza del destino" by Giuseppe Verdi.  The motion picture was executive produced by Shep Gordon and Carolyn Pfeiffer.  It features original music by veteran composer Ennio Morricone.

Gregory Nava: Gregory James Nava (born April 10, 1949) is an American film director, producer and screenwriter.

Fists in the Pocket: Fists in the Pocket (I pugni in tasca) is a 1965 Italian film directed by Marco Bellocchio.  It was Bellocchio's debut film.

Fabio Garriba: Born in Soave, Garriba started his career on stage, and in 1969 he made his film debut in Dziga Vertov Group's "Le Vent d'est".  He later worked with prominent directors such as Roberto Rossellini, Bernardo Bertolucci, Ettore Scola, Marco Bellocchio and Luigi Magni.  He also had leading roles in films directed by his twin brother Mario, notably the Golden Leopard winner "On the Point of Death".

La colpa e la pena: La colpa e la pena is a 1961 Italian film directed by Marco Bellochio.  The screenplay and the story were also was written by Marco Bellocchio.

Il gabbiano: Il gabbiano ] (i.e. "The seagull") is a 1977 Italian drama film written and directed by Marco Bellocchio.  It is loosely based on the Anton Chekhov's drama play "The Seagull".

My Family (film): My Family is a 1995 independent American drama film directed by Gregory Nava, written by Nava and Anna Thomas, and starring Jimmy Smits, Edward James Olmos, and Esai Morales.  The film depicts three generations of a Mexican American family who emigrated from Mexico and settled in East Los Angeles.

Marco Bellocchio: Marco Bellocchio (] ; born 9 November 1939) is an Italian film director, screenwriter, and actor.

Supporting paragraphs: Gregory Nava Marco Bellocchio
Answer: film director, screenwriter