Title: Gamer (2009 film)
Content:  Gamer is a 2009 American science fiction action film written and directed by Mark Neveldine and Brian Taylor. The film stars Gerard Butler as a participant in an online game in which participants can control human beings as players, and Logan Lerman as the player who controls him. Alongside Butler and Lerman, it also stars Michael C. Hall, Ludacris, Amber Valletta, Terry Crews, Alison Lohman, John Leguizamo, Sam Witwer and Zoë Bell. Gamer was released in North America on September 4, 2009, receiving generally negative reviews from critics and grossed $43 million worldwide against a production budget of $50 million.
Title: Gamer (2011 film)
Content:  Gamer (Гамep), alternatively spelt Gámer or Gaamer, was a debut feature-length film directed by Oleg Sentsov. It was released in Russian and Ukrainian language in 2011. He tells of a young gamer, who lives with his mother in Simferopol. The premiere was held in 2012 in Rotterdam. The film participated in several international film festivals and was a highly marked by the professional community, in particular, a premium Russian Guild of Film Critics at the festival  Spirit of Fire  in Khanty-Mansiysk.
Title: Gamer (2009 film)
Content:  In May 2007, Lakeshore Entertainment re-teamed with Mark Neveldine and Brian Taylor, the creators of Crank (2006), to produce a "high-concept futuristic thriller" called Game. Neveldine and Taylor wrote the script for Game and were slated to direct the film, while actor Gerard Butler was cast into the lead role.
Title: The Gamer
Content:  The Gamer (Korean: 더 게이머, RR: Deo Geimeo) is a South Korean webtoon hosted by Naver WEBTOON. The webtoon is loosely influenced by fantasy RPGs, Dungeons & Dragons, and comic fantasy book series Discworld but set in contemporary South Korea. Once the main protagonist, Han Jihan, notices a dialogue box in front of him like in a video game, he recognizes that he has become a video game character, and supernatural events start happening.
Title: Gamer (2009 film)
Content: Gerard Butler as John "Kable" Tillman, the highest-ranked warrior in the game Slayers. ; Amber Valletta as Angie "Nika" Roth Tillman, Kable's wife, an avatar in Society. ; Michael C. Hall as Ken Castle, the wealthy manipulative, ruthless and famous creator of Society and Slayers, and a top genius professional computer programmer. ; Kyra Sedgwick as Gina Parker Smith, a famous talk show host who meets the Humanz and investigates them. ; Logan Lerman as Simon Silverton, the 17-year-old gamer "playing" Kable. ; Ariana Scott as Shelley Silverton aka SISSYPUSS, the sister of Simon ; Terry Crews as Hackman, a psychopathic inmate sent to murder Kable. ; Alison Lohman as Trace, a member of the Humanz. ; Ludacris as Brother, the spokesperson and 
Title: The Gamers (film)
Content:  The Gamers is a 2002 film written and directed by Matt Vancil and produced by independent movie company Dead Gentlemen Productions. It is an affectionate spoof of role-playing games, and often shown at gaming conventions. A sequel, The Gamers: Dorkness Rising, was released in 2008. A second sequel, The Gamers: Hands of Fate, was released in 2013.
Title: Gamer (2011 film)
Content: Vladislav Zhuk as Lyosha ; Alexander Fedotov as Bur ; Zhanna Biryuk as mother 
Title: Gamer (2009 film)
Content:  of the Humanz. ; Aaron Yoo as Dude, a member of the Humanz and a hacker. ; John Leguizamo as Freek, an inmate who befriends Kable. ; Zoë Bell as Sandra, an inmate. ; Mimi Michaels as Stikkimuffin, another teenage gamer. A fan of Simon. ; Ashley Rickards as 2KATCHAPREDATOR (a girl dating an inmate) ; Jade Ramsey and Nikita Ramsey as the KUMDUMPSTAZ (British twins) ; Milo Ventimiglia as Rick Rape ; Jonathan Chase as Geek Leader, the head of Castle's technical team. ; Keith David as Agent Keith, a CIA agent.  Joseph D. Reitman and John de Lancie appear as senior members of Castle’s company. Lloyd Kaufman appears as Genericon. James Roday Rodriguez and Maggie Lawson cameo as news anchors.
Title: Gamer (2009 film)
Content:  In March 2009, the film's working title was changed from Game to Citizen Game. In May 2009, another name change was announced, the new name being Gamer.
Title: 360 Gamer
Content:  Launched and edited for the first two years by Stu Taylor, the current 360 Gamer staff are veterans of British videogames journalism, including editors James Artaius (former news editor of XBM and founding editor of FSM) and Ian Collen (formerly of Play Gamer and XBM), and staff writer Will Johnston (former news editor of Play and contributor to Play Gamer).

Question: Who was the screenwriter for Gamer?
Answer: Mark Neveldine.