Question: What was the nationality of the person who wrote the original screenplay for "Screamers"?

full_context: Document 1: Dan O'Bannon: Daniel Thomas "Dan" O'Bannon (September 30, 1946 – December 17, 2009) was an American film screenwriter, director, visual effects supervisor, and occasional actor, usually in the science fiction and horror genres.
Document 2: Screamers (1995 film): Screamers is a 1995 Canadian-American dystopian science fiction film starring Peter Weller, Roy Dupuis, and Jennifer Rubin, and directed by Christian Duguay. The screenplay, written by Dan O'Bannon with a rewrite by Miguel Tejada-Flores, is based on Philip K. Dick's short story "Second Variety", and addresses themes commonly found in that author's work: societal conflict, confusion of reality and illusion, and machines turning upon their creators. Although critical reaction to the film was generally negative at the time of its release, it has gained a cult following. A sequel "", was released in 2009, to equally mixed reviews.
Document 3: Supernova (2000 film): Supernova is a 2000 Swiss-American science fiction horror film written by David C. Wilson, William Malone and Daniel Chuba and directed by Walter Hill, credited as "Thomas Lee." "Thomas Lee" was chosen as a directorial pseudonym for release, as the name Alan Smithee had become too well known as a badge of a film being disowned by its makers. It was originally developed in 1988 by director William Malone as "Dead Star," with paintings by H. R. Giger and a plot that had been called ""Hellraiser" in outer space." Jack Sholder was hired for substantial uncredited reshoots, and Francis Ford Coppola was brought in for editing purposes. Various sources suggest that little of Hill's work remains in the theatrical cut of the film. The film shares several plot similarities with the film "Event Horizon," released in 1997, and "Alien Cargo," released in 1999. The cast featured James Spader, Angela Bassett, Robert Forster, Lou Diamond Phillips, Peter Facinelli, Robin Tunney, and Wilson Cruz. This film was shot by cinematographer Lloyd Ahern and scored by composers David C. Williams and Burkhard Dallwitz.
Document 4: RoboCop: RoboCop is a 1987 American cyberpunk science fiction superhero action film directed by Paul Verhoeven and written by Edward Neumeier and Michael Miner. The film stars Peter Weller, Nancy Allen, Dan O'Herlihy, Kurtwood Smith, Miguel Ferrer, and Ronny Cox. Set in a crime-ridden Detroit, Michigan, in the near future, "RoboCop" centers on police officer Alex Murphy (Weller) who is murdered by a gang of criminals and subsequently revived by the megacorporation Omni Consumer Products (OCP) as a superhuman cyborg law enforcer known as RoboCop.
Document 5: Shocking Dark: Shocking Dark (also known as Terminator II, Terminator 2, Alienators, and Contaminator) is a 1989 Italian science-fiction film written by Claudio Fragasso, produced by Franco Gaudenzi and directed by Bruno Mattei.
Document 6: Radio Free Albemuth (film): Radio Free Albemuth is a 2010 American film adaptation of the dystopian novel "Radio Free Albemuth" by author Philip K. Dick, which was written in 1976 and published posthumously in 1985. The film is written, directed, and produced by John Alan Simon and stars Jonathan Scarfe and Shea Whigham.
Document 7: Total Recall (2012 film): Total Recall is a 2012 American science-fiction action film directed by Len Wiseman. The screenplay by Kurt Wimmer and Mark Bomback was based on the 1990 film of the same name, which was inspired by the 1966 short story "We Can Remember It for You Wholesale" by Philip K. Dick. The film stars Colin Farrell, Kate Beckinsale, Jessica Biel, Bryan Cranston, Bokeem Woodbine, John Cho, and Bill Nighy. Unlike the first film, the setting is on a dystopian Earth, not Mars and has more political themes. The film blends American and Asian influences, notably in the settings and dominant populations of the two nation-states in the story: the United Federation of Britain (Western Europe) and the Colony (Australia).
Document 8: Dan Simmons: Dan Simmons (born April 4, 1948) is an American science fiction and horror writer. He is the author of the Hyperion Cantos and the Ilium/Olympos cycles, among other works which span the science fiction, horror, and fantasy genres, sometimes within a single novel. A typical example of Simmons' intermingling of genres is "Song of Kali" (1985), winner of World Fantasy Award. He also writes mysteries and thrillers, some of which feature the continuing character Joe Kurtz.
Document 9: Dan Curtis: Dan Curtis (born Daniel Mayer Cherkoss; August 12, 1927 – March 27, 2006) was an American director and producer of television and film, best known among fans of horror films for his afternoon TV series "Dark Shadows" and TV films such as "Trilogy of Terror". "Dark Shadows" originally aired from 1966 to 1971 and has aired in syndication for nearly 40 years. Curtis was responsible for the 1991 remake of "Dark Shadows", which was canceled due to low ratings.
Document 10: Alien (film): Alien is a 1979 science-fiction horror film directed by Ridley Scott, and starring Sigourney Weaver, Tom Skerritt, Veronica Cartwright, Harry Dean Stanton, John Hurt, Ian Holm and Yaphet Kotto. The film's title refers to a highly aggressive extraterrestrial creature that stalks and attacks the crew of a spaceship. Dan O'Bannon, drawing upon previous works of science fiction and horror, wrote the screenplay from a story he co-authored with Ronald Shusett. The film was produced by Gordon Carroll, David Giler and Walter Hill through their company Brandywine Productions, and was distributed by 20th Century Fox. Giler and Hill revised and made additions to the script. Shusett was executive producer. The eponymous Alien and its accompanying elements were designed by the Swiss artist H. R. Giger, while concept artists Ron Cobb and Chris Foss designed the more human aspects of the film.
Document 11: Blade Runner: Blade Runner is a 1982 American neo-noir science fiction film directed by Ridley Scott and starring Harrison Ford, Rutger Hauer, Sean Young, and Edward James Olmos. The script was written by Hampton Fancher and David Peoples, and is a loose adaptation of the 1968 novel "Do Androids Dream of Electric Sheep?" by Philip K. Dick. Set in a dystopian Los Angeles in 2019, the story depicts a future in which bioengineered androids known as replicants are manufactured by the powerful Tyrell Corporation to work on off-world colonies. When a renegade group of replicants led by Roy Batty (Hauer) escape back to Earth, burnt-out LA cop Rick Deckard (Ford) reluctantly accepts one last assignment to hunt them down. During his investigations, Deckard meets Rachael (Young), an advanced replicant who causes him to question his mission.
Document 12: Ray Bradbury: Ray Douglas Bradbury (August 22, 1920June 5, 2012) was an American author and screenwriter. He worked in a variety of genres, including fantasy, science fiction, horror, and mystery fiction.
Document 13: The Matrix: The Matrix is a 1999 science fiction action film written and directed by The Wachowskis, starring Keanu Reeves, Laurence Fishburne, Carrie-Anne Moss, Hugo Weaving, and Joe Pantoliano. It depicts a dystopian future in which reality as perceived by most humans is actually a simulated reality called "the Matrix", created by sentient machines to subdue the human population, while their bodies' heat and electrical activity are used as an energy source. Computer programmer Neo learns this truth and is drawn into a rebellion against the machines, which involves other people who have been freed from the "dream world."
Document 14: Dan Ouellette: Dan Ouellette is an American artist, illustrator, director, author and production designer. He began drawing as a child inspired by Escher, Dalí and Moebius. His drawings usually begin with very rough sketches and are intended to capture a moment of tension or eroticism. His art pushes his audience into areas where people feel less than comfortable, stating that the "US which is so puritanical, our bodies are usually a great source of anxiety and fear". As a production designer, he has designed over fifteen independent feature films in the past decade as well as numerous commercials and music videos. He is best known as the director for the music videos "Blue" and "Looking Glass" by The Birthday Massacre, receiving over 4 million combined views on YouTube, and has directed music videos for the industrial band Android Lust. He has done production design for many films over the years including "Chasing Sleep" starring Jeff Daniels. Dan's artwork is strongly themed around surrealism and mostly done in pencil. As an artist he has exhibited widely. He has been published in numerous anthology art books including "Bio-Mannerism" which also features work by H.R. Giger and Beksinski, and he has been featured in magazines internationally. David Bowie commented while looking at Dan's art that he has noticed a strong influence of science fiction on contemporary art. Giger saw a different aspect, saying simply "Very bony." He grew to adore the cinema of Fellini and later to marvel at Lynch's "Eraserhead". Rather than pursue a formal education in the fine arts he chose to study the craft of film making and after college he became a production designer working on feature films in New York City starting with his work as a production designer for Hal Hartley in 1990 with Trust and then, in 1992, with Simple Men.
Document 15: A Scanner Darkly (film): A Scanner Darkly is a 2006 American animated science-fiction thriller film directed by Richard Linklater, based on the novel of the same name by Philip K. Dick. The film tells the story of identity and deception in a near-future dystopia constantly under intrusive high-tech police surveillance in the midst of a drug addiction epidemic. The film was shot digitally and then animated using interpolated rotoscope, an animation technique in which animators trace over the original footage frame by frame, for use in live-action and animated films, giving the finished result a distinctive animated look. It was distributed by Warner Independent Pictures.
ground_truth: American