Question: Were W. D. Richter and René Laloux both screenwriters?

Context articles: Paul Gégauff
Richter Pass
Gandahar (film)
Les Maîtres du temps
Fantastic Planet
W. D. Richter
Chesney and Wolfe
Oriental Tales
René Laloux
The Violet of Potsdamer Platz

Paul Gégauff (1922–1983) was a French screenwriter, actor and director.
 He collaborated with director Claude Chabrol on 14 films.
 Among his films are "Les Biches", "Plein Soleil" and the autobiographical "Une Partie de Plaisir".
 In 1962, he and René Clement received an Edgar Award from the Mystery Writers of America as the screenwriters for "Plein Soleil", which was named Best Foreign Language Film.
Richter Pass is a mountain pass to the south of the summit of British Columbia highway 3 (the Crowsnest Highway) between Keremeos (W) and Osoyoos (E), linking the Similkameen Valley with the South Okanagan over the southernmost end of the Thompson Plateau.
 The pass is traversed by Old Richter Pass Road and is ~650 m in elevation though the name is generally used for the route of Highway 3 as well.
Gandahar is a 1988 French animated science fantasy film.
 The original version was directed by René Laloux, and was based on Jean-Pierre Andrevon's novel "Les Hommes-machines contre Gandahar" ("The Machine-Men versus Gandahar").
Les Maîtres du temps (lit.
 "The Masters of Time", a.k.a. "Time Masters", "Az idő urai" in Hungarian) is a 1982 Franco-Hungarian animated science fiction feature film directed by René Laloux and designed by Mœbius.
 It is based on the 1958 science fiction novel "L'Orphelin de Perdide" ("The Orphan of Perdide") by Stefan Wul.
Fantastic Planet (French: La Planète sauvage , Czech: Divoká planeta , lit.
 "The Wild Planet") is a 1973 animated science fiction film directed by René Laloux and written by Laloux and Roland Topor.
 Topor also completed the film's production design and it was animated at Jiří Trnka Studio in Prague.
 The film was an international co-production between companies from France and Czechoslovakia.
 The allegorical story, about humans living on a strange planet dominated by giant humanoid aliens who consider them animals, is based on the 1957 novel "Oms en série" by French writer Stefan Wul.
W. D. Richter (born December 7, 1945, New Britain, Connecticut) is a screenwriter and film director and producer.
 He is best known for adapting "Invasion of the Body Snatchers", directing "The Adventures of Buckaroo Banzai Across the 8th Dimension" and co-writing "Big Trouble in Little China".
Ronald Chesney (birth name René Cadier; born 1922) and Ronald Wolfe (birth name Harvey Ronald Wolf-Lubbroff; 8 August 1922 – 18 December 2011) were British TV comedy screenwriters, best known for their popular (and most successful) 1960s and 1970s sitcoms, "The Rag Trade" (1961–63, 1977–78), "Meet the Wife" (1963–66), "On the Buses" (1969–73) and Romany Jones (1972–75).
Oriental Tales (French: Nouvelles orientales ) is a 1938 short story collection by the French writer Marguerite Yourcenar.
 The stories share a self-consciously mythological form; some are based on pre-existing myths and legends, while some are new.
 The story "How Wang-Fo Was Saved" was adapted into an animated short film by René Laloux in the 1980s.
René Laloux (July 13, 1929 – March 14, 2004) was a French animator and film director.
The Violet of Potsdamer Platz (German: Das Veilchen vom Potsdamer Platz) is a 1936 German drama film directed by Johann Alexander Hübler-Kahla and starring Rotraut Richter, Paul W. Krüger and Margarete Kupfer.