Investigation of a Citizen Above Suspicion (Italian: Indagine su un cittadino al di sopra di ogni sospetto ) is a 1970 Italian crime drama film directed by Elio Petri.
 It is a dramatic, psychological, black-humored satire on corruption in high office, telling the story of a top police officer who kills his mistress, and then tests whether the police would charge him for this crime.
 He begins manipulating the investigation by planting obvious clues while the other police officers ignore them, either intentionally or not.
High Infidelity (Italian: Alta infedeltà ) is a 1964 Italian comedy film directed by Mario Monicelli, Elio Petri, Franco Rossi and Luciano Salce.
The Assassin (Italian: "L'assassino" ) is a 1961 Italian crime film directed by Elio Petri.
 It is the feature film debut of Petri.
 It was entered into the 11th Berlin International Film Festival.
We Still Kill the Old Way (Italian: A ciascuno il suo ) is a 1967 Italian crime film directed by Elio Petri.
 It was entered into the 1967 Cannes Film Festival where it won the award for Best Screenplay.
 It is based on the novel "To Each His Own" by Leonardo Sciascia.
Property Is No Longer a Theft (Italian: La proprietà non è più un furto ) is a 1973 Italian comedy film directed by Elio Petri.
 It was entered into the 23rd Berlin International Film Festival.
Good News (Italian: "Buone notizie" ) is a 1979 Italian satirical comedy film written and directed by Elio Petri and starring Giancarlo Giannini.
 It is the last film of Petri.
Todo modo is a 1976 Italian drama film directed by Elio Petri.
 It is based on a novel of the same name by Leonardo Sciascia.
Elio Petri (29 January 1929 – 10 November 1982) was an Italian political filmmaker.
Luigi Kuveiller (3 October 1927 - 10 January 2013) was an Italian cinematographer, best known for his collaboration with Elio Petri.
Ralph Foster Smart {'1': ", '2': ", '3': ", '4': "} (27 August 1908 – 12 February 2001) was a film and television producer, director, and writer, born in England to Australian parents.

Question: What occupation do Elio Petri the Italian and English-Australian Ralph Smart share?
Answer: filmmaker