Question: Are León Klimovsky and Roger Avary both screenwriters?

Context articles: The Vampires Night Orgy
Suburb (1951 film)
Roger Avary
A Few Dollars for Django
The Marihuana Story
Glitterati (film)
La Noche de Walpurgis
León Klimovsky
La Vida color de rosa
The Earring

The Vampires Night Orgy (Spanish: "La orgía nocturna de los vampiros" ) is a 1972 Spanish horror film directed by León Klimovsky.
Suburb (Spanish: Suburbio) is a 1951 Argentine drama film directed by León Klimovsky and starring Pedro López Lagar, Fanny Navarro and Zoe Ducós.
 The film portrays life in one of the poorer neighborhoods of Buenos Aires.
 Under pressure from the Peronist authorities, Klimovsky changed the ending to suggest that the problems of such communities were now a thing of the past.
Roger Avary (born August 23, 1965) is a Canadian film and television producer, screenwriter and director in the American mass media industry.
 He worked on "Reservoir Dogs" and "Pulp Fiction", for which he and Quentin Tarantino were awarded the Oscar for Best Original Screenplay at the 67th Academy Awards.
 He wrote the screenplays for "Silent Hill" and "Beowulf".
 He also directed "Killing Zoe" and "The Rules of Attraction".
A Few Dollars for Django (Italian: "Pochi dollari per Django") is a 1966 Italian Spaghetti Western film directed by León Klimovsky and starring Anthony Steffen.
 Although he was credited as a second unit director, Enzo G. Castellari directed a main part of the film.
The Marihuana Story (Spanish: "Marihuana" ) is a 1950 Argentine film directed by León Klimovsky.
 It was entered into the 1951 Cannes Film Festival.
Glitterati is a 2004 film directed by Roger Avary assembled from the 70 hours of video footage shot for the European sequence of "The Rules of Attraction" in October 2001.
 It serves to expand upon the very minimally detailed and rapidly recapped story told by the character of Victor Ward (portrayed by Kip Pardue, featured in Avary's other film "The Rules of Attraction") upon his return to the United States after having traveled extensively around Europe.
 Expanding upon those events, the film was intended as a connecting bridge between "The Rules of Attraction" and a planned film adaptation of Bret Easton Ellis' 1998 novel "Glamorama", which was to be directed by Avary and star Pardue.
 Avary has called the film a "pencil sketch of what will ultimately be the oil painting of "Glamorama"."
La Noche de Walpurgis (Walpurgis Night, released in the United States as The Werewolf vs. The Vampire Woman, and in the UK as Shadow of the Werewolf [theatrical] and Werewolf Shadow [video]), is a 1970 Spanish horror film starring Paul Naschy, the fifth in a series about the werewolf Waldemar Daninsky.
 This film was directed by León Klimovsky and written by Naschy and Hans Munkel, and is generally regarded to have kickstarted the Spanish horror film boom of the Seventies, due to its awesome box office success upon its release.
 Patty Shepard was so convincing as the vampiric Countess, it was thought at the time that she might replace actress Barbara Steele as Europe's reigning horror queen.
 Klimovsky filmed many of the scenes in slow motion, to add to the otherworldliness of the film.
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León Klimovsky (16 October 1906–8 April 1996) was an Argentine film director, screenwriter and film producer.
La Vida color de rosa is a 1951 Argentine comedy film directed by León Klimovsky written by Carlos A. Petit.
The film starred Virginia Luque and José María Gutiérrez.
The Earring (Spanish:El Pendiente) is a 1951 Argentine thriller film directed by León Klimovsky and starring Mirtha Legrand.
 It is a film noir based on a story by Cornell Woolrich.
 The film's art direction was by Germán Gelpi and Mario Vanarelli.