Question: The fantasy television series Jason Momoa was in from 2011-2012 is based on a book series by what author?
Context: Joseph Jason Namakaeha Momoa (born August 1, 1979) is an American actor, model, director, writer, and producer.  He is known for his television roles as Ronon Dex on the military science fiction television series "Stargate Atlantis" (2004–2009) and as Khal Drogo in the HBO fantasy television series "Game of Thrones" (2011–2012). The Red Road is an American drama television series that aired on SundanceTV from February 27, 2014 to May 7, 2015.  This was SundanceTV's second fully owned scripted original series; the first was "Rectify".  "The Red Road" was canceled after its second season, confirmed by Jason Momoa, who played Phillip Kopus in the series. The fourth season of "Stargate Atlantis", an American-Canadian television series, began airing on September 28, 2007 on the US-American Sci Fi Channel.  The fourth season concluded after 20 episodes on March 7, 2008 on Sci Fi.  The series was developed by Brad Wright and Robert C. Cooper, who also served as executive producers.  Amanda Tapping (Col. Samantha Carter) joins the cast as a regular for 14 episodes, Jewel Staite (Dr. Jennifer Keller) was a recurring character for eleven episodes, while regular cast member Torri Higginson (Dr. Elizabeth Weir) was a recurring cast member for four episodes.  Other season four regular cast members include Joe Flanigan, David Hewlett, Rachel Luttrell and Jason Momoa. Khal Drogo is a fictional character in the "A Song of Ice and Fire" series of fantasy novels by American author George R. R. Martin, and its television adaptation "Game of Thrones". Conan the Barbarian is a 2011 American sword and sorcery film based on the character of the same name created by Robert E. Howard.  The film is a new interpretation of the "Conan" mythology, and is not related to the films featuring Arnold Schwarzenegger.  It stars Jason Momoa in the title role, alongside Rachel Nichols, Rose McGowan, Stephen Lang, Ron Perlman, and Bob Sapp with Marcus Nispel directing. Encantadia is a Philippine fantasy television series by GMA Network based from the 2005 fantasy television series of the same name.  Acting as a reboot (often called as "requel" or retelling-sequel), it was the fourth series in the Encantadia franchise and was aired eleven years after the third one.  The show premiered on July 18, 2016 in the Philippines and worldwide through GMA Pinoy TV and ended on May 19, 2017.  It is also shown exclusively online through iflix at 1080p high-definition video as video on demand. The third season of "Stargate Atlantis", an American-Canadian television series, began airing on July 21, 2006 on the US-American Sci Fi Channel.  The third season concluded after 20 episodes on February 5, 2007 on the Canadian The Movie Network.  The series was developed by Brad Wright and Robert C. Cooper, who also served as executive producers.  Season three regular cast members include Joe Flanigan, Torri Higginson, Jason Momoa, Rachel Luttrell, Paul McGillion, and David Hewlett as Dr. Rodney McKay. The second season of the television series "Stargate Atlantis" commenced airing on the Sci Fi Channel in the United States on July 15, 2005, concluded on The Movie Network in Canada on January 30, 2006, and contained 20 episodes.  The show itself is a spin off of its sister show, "Stargate SG-1".  The series was developed by Brad Wright and Robert C. Cooper, who also served as executive producers.  Season two regular cast members include Joe Flanigan, Torri Higginson, Jason Momoa, Rachel Luttrell, Paul McGillion, and David Hewlett as Dr. Rodney McKay.  The second season focuses on the Atlantis Expedition continuing to make the Wraith think that the city self-destructed, (The Siege Part III) while continuing to explore Pegasus and hunt for ZPMs (although they do have one now) this means at times lying to new allies about the city even sometimes claiming to be a small contingent that escaped the Siege; the season also marks the first time the Expedition is able to make contact with Earth although doing so uses a lot of power so the contact is oftentimes via the Daedalus, an intergalactic Earth-Asgard vessel commanded by Col. Steven Caldwell who makes clear his desire to be Military Leader of Atlantis but eventually settles for a sort of advisory role as it becomes clear that Dr. Weir and the Lt.Col Sheppard are a duo not to be messed with.  The central plot of the second season is the development of Dr. Beckett's retrovirus, which can, theoretically, turn a Wraith into a human. Bullet to the Head is a 2012 American action thriller film directed by Walter Hill.  The screenplay by Alessandro Camon was based on the French graphic novel "Du Plomb Dans La Tête" written by Matz and illustrated by Colin Wilson.  The film stars Sylvester Stallone, Sung Kang, Sarah Shahi, Adewale Akinnuoye-Agbaje, Christian Slater, and Jason Momoa.  Alexandra Milchan, Alfred Gough, Miles Millar, and Kevin King-Templeton produced the film.  The movie follows a hitman and a cop who are forced to work together to bring down a corrupt businessman and mafia boss after they are targeted by the latter's associates. Ronon Dex is a fictional character in the science fiction television series "Stargate Atlantis".  Played by Jason Momoa, he is a Satedan, a civilization from the Pegasus Galaxy who had a technological level comparable to Earth in the mid-20th century but met the fate of all advanced civilizations in Pegasus when their homeworld Sateda (P3R-534) was devastated several years ago by the Wraith.  When Ronon Dex and the Atlantis expedition first met in the season 2 episode "Runner", Ronon Dex had been a Runner for the past seven years.  He joined the Atlantis Expedition shortly afterwards, effectively replacing Aiden Ford on Sheppard's team after Ford had become addicted to a Wraith enzyme and had fled Atlantis.
Answer: George R. R. Martin