François Boyer (1920 - 24 May 2003) was a French screenwriter.
 He achieved considerable success with his first attempt at screenwriting, "Forbidden Games" (1952).
 Initially, he found no studio interested in his work, so he redesigned the screenplay as a novel and published it in 1947 under the title "The Secret Game".
 Although the novel achieved little or no success in its native country, it became a huge commercial success in America.
 All of a sudden, Boyer's novel was a hot property, so director René Clément, in conjunction with two writers Jean Aurenche and Pierre Bost, helped turn it into a screenplay.
 While Boyer receives story credit for the film, little is known of how much of his own screenplay made it to the screen.
 The film was a huge international success, and won an Honorary Oscar for the best foreign language film of its year.
Gervaise is a 1956 French film directed by René Clément based on the novel "L'Assommoir" by Émile Zola.
 It depicts a working-class woman in the mid-nineteenth century (played by Maria Schell) trying to cope with the descent of her husband (played by François Périer) into alcoholism.
 The film was nominated for the Best Foreign Language Film at the 29th Academy Awards.
 Schell won the Volpi Cup for Best Actress at the 1956 Venice Film Festival for her performance.
This Angry Age (also known as The Sea Wall, Barrage contre le Pacifique and La diga sul Pacifico) is a 1958 drama film directed by René Clément and produced by Dino De Laurentiis.
 It is an adaptation of Marguerite Duras' 1950 novel, "The Sea Wall".
 The film stars Anthony Perkins and Silvana Mangano.
 The original novel was adapted again in 2008 by Rithy Panh as "The Sea Wall", starring Isabelle Huppert.
Jean Aurenche (1903–1992) was a French screenwriter.
 During his career, he wrote 80 films for directors such as René Clément, Bertrand Tavernier, Marcel Carné, Jean Delannoy, Sidney Lumet and Claude Autant Lara.
 He is often associated with the screenwriter Pierre Bost, with whom he had a fertile partnership from 1940 to 1975.
And Hope to Die (French: "La course du lièvre à travers les champs" , Italian: "La corsa della lepre attraverso i campi" ) is a 1972 French-Italian thriller-drama film directed by René Clément and starring Jean-Louis Trintignant and Robert Ryan.
 It is loosely based on the novel "Black Friday" by David Goodis.
Purple Noon (Original: Plein soleil) (Italian: "Delitto in pieno sole"), (aka "Full Sun", "Blazing Sun", "Lust for Evil" and "Talented Mr. Ripley"), is a 1960 French-Italian film directed by René Clément, loosely based on the 1955 novel "The Talented Mr. Ripley" by Patricia Highsmith.
 The film stars Alain Delon in his first major film, along with Maurice Ronet (as Philippe Greenleaf) and Marie Laforêt (as Marge); Romy Schneider appears briefly in an uncredited role as Freddie Miles' companion, and Billy Kearns (an expatriate American actor well liked in France) plays Greenleaf's friend Freddy Miles.
 The film, principally in French, contains brief sequences in Italian.
Wanted: Babysitter (French: "La Baby-Sitter" ,Italian: "Babysitter - Un maledetto pasticcio" , German: "Das ganz große Ding" , also known as Scar Tissue, "The Babysitter" and "The Raw Edge") is a 1975 Italian-French-German thriller–drama film directed by René Clément at his final film before his death on March 17, 1996.
 The film stars Maria Schneider, Sydne Rome, Vic Morrow, Robert Vaughn, and Nadja Tiller.
The Damned (French: Les Maudits ) is a 1947 French drama film directed by René Clément.
 It was entered into the 1947 Cannes Film Festival.
 The film is notable for its depiction of the interior of a wartime submarine and for its tracking shots through the length of the U-boat.
René Clément (] ; 18 March 1913 – 17 March 1996) was a French film director and screenwriter.
Sir David Lean, CBE (25 March 190816 April 1991) was an English film director, producer, screenwriter and editor, responsible for large-scale epics such as "The Bridge on the River Kwai" (1957), "Lawrence of Arabia" (1962) and "Doctor Zhivago" (1965).
 He also directed adaptations of Dickens novels "Great Expectations" (1946) and "Oliver Twist" (1948), as well as the romantic drama "Brief Encounter" (1945).

Question: Are René Clément and David Lean both film directors ?
Answer: yes