Question: What is the nationality of the screenwriter who wrote the 2013 psychological thriller film directed by Denis Villeneuve?

Context articles: Prisoners (2013 film)
Javier Gullón
List of accolades received by Arrival
Enemy (2013 film)
Katerina Mikailenko
Enter the Dangerous Mind
Pawan Kumar (director)
The Removed
Polytechnique (film)
August 32nd on Earth

Prisoners is a 2013 American thriller film directed by Denis Villeneuve from a screenplay written by Aaron Guzikowski.
 The film has an ensemble cast including Hugh Jackman, Jake Gyllenhaal, Viola Davis, Maria Bello, Terrence Howard, Melissa Leo and Paul Dano.
 It is Villeneuve's first English-language feature film.
Javier Gullón is a Spanish screenwriter.
 He garnered a Canadian Screen Award nomination for Best Adapted Screenplay at the 2nd Canadian Screen Awards for "Enemy", and a Goya Award nomination for Best Adapted Screenplay at the 27th Goya Awards for "Invader (Invasor)".
"Arrival" is a 2016 American science fiction film directed by Denis Villeneuve and written by Eric Heisserer.
 Starring Amy Adams, Jeremy Renner and Forest Whitaker, the film focuses on the contact between the linguist and aliens in one of 12 extraterrestrial spacecraft which appeared across the Earth.
 The film had its world premiere at the Venice Film Festival on September 1, 2016 and was released to theaters on November 11, 2016.
 The film was released to positive reviews, with Rotten Tomatoes aggregating an approval rating of 94%, based on 327 reviews, with an average rating of 8.3/10 and Metacritic giving a score of 81 out of 100, based on 52 reviews.
Enemy is a 2013 psychological thriller film directed by Denis Villeneuve, produced by M.S. Faura and Niv Fichman and written by Javier Gullón, loosely adapted from José Saramago's 2002 novel "The Double".
 The film stars Jake Gyllenhaal, Mélanie Laurent and Sarah Gadon and revolves around two men who are physically identical.
 It is also internationally co-produced by production companies from Spain and Canada.
Katerina Mikailenko is an American actress, model, and dancer best known for her numerous guest appearances on various network television shows and for her memorable role as Wilhelmina "Billie" Lewis in the 2013 psychological thriller "The Employer" starring Malcolm McDowell.
 She grew up in a small town near Portland, Oregon and has also lived in San Diego and Los Angeles.
Enter the Dangerous Mind, also known under its original title of Snap, is a 2013 psychological thriller film that was directed by Youssef Delara and Victor Teran.
 The film had its world premiere on 11 March 2013 at the South by Southwest Film Festival and it will have a theatrical release on 6 February 2015.
 "Enter the Dangerous Mind" stars Jake Hoffman as an EDM musician that falls into madness after his relationship with a beautiful woman (Nikki Reed) turns sour.
Pawan Kumar (Born 29 October 1982) is a film Director, Actor, Producer and Screenwriter in the Kannada film industry.
 He is well known for the films "Manasaare", "Pancharangi", his directorial debut "Lifeu Ishtene" and the 2013 psychological thriller "Lucia" became one of the biggest turning points of his career.
 Being from a theatre background, he wrote scripts for plays on stage before working as an associate director with Yograj Bhat.
The Removed - later retitled AFTER EFFECT - is a 2013 psychological thriller film directed by David McElroy and starring Daniel Baldwin, Tuckie White, and singer Alja Jackson.
Polytechnique is a 2009 Canadian film directed by Denis Villeneuve and written by Villeneuve and Jacques Davidts.
 Set in Montreal, Quebec and based on the École Polytechnique massacre (also known as the "Montreal Massacre"), the film documents the events of December 6, 1989, through the eyes of two students who witness a gunman murder fourteen young women.
August 32nd on Earth (French: Un 32 août sur terre , and also known as "32nd Day of August on Earth") is a 1998 Canadian drama film directed by Denis Villeneuve.
 It was screened in the Un Certain Regard section at the 1998 Cannes Film Festival.
 Alexis Martin won the Prix Jutra for Best Actor.
 The film was selected as the Canadian entry for the Best Foreign Language Film at the 71st Academy Awards, but was not nominated.