Question: The Twilight Saga: Breaking Dawn – Part 1 was based on the books by which American young adult writer?
Context: The Twilight Saga: The Official Illustrated Guide (previously titled The Official Guide) is a spin-off encyclopedic reference book for the "Twilight Saga" book series, written by Stephenie Meyer and was released on April 12, 2011.  "The Guide" includes exclusive new material about the world Meyer created in "Twilight", "New Moon", "Eclipse", "Breaking Dawn" and "The Short Second Life of Bree Tanner", and nearly a hundred full-color illustrations by illustrator Young Kim, who previously illustrated Meyer's #1 "New York Times" Best Seller "", and several other artists. The following is a list of characters in the "Twilight" novel series by Stephenie Meyer, comprising the books; "Twilight", "New Moon", "Eclipse" and "Breaking Dawn", as well as "The Twilight Saga" film series adaptations. The Twilight Saga: Breaking Dawn – Part 2 (commonly referred to as Breaking Dawn: Part 2) is a 2012 American romantic drama fantasy film directed by Bill Condon and based on the novel "Breaking Dawn" by Stephenie Meyer.  The second part of a two-part film forms the fifth and final installment in "The Twilight Saga" film series, and is the conclusion of the 2011 film "".  All three main cast members, Kristen Stewart, Robert Pattinson and Taylor Lautner, reprise their roles, with Mackenzie Foy portraying Renesmee Cullen.  Alongside Pattinson, Lautner, Stewart and Foy, the film also stars an ensemble cast such as Billy Burke, Peter Facinelli, Elizabeth Reaser, Kellan Lutz, Nikki Reed, Jackson Rathbone, Ashley Greene, Michael Sheen and Dakota Fanning. This is a list of the cast members from The Twilight Saga film series, which is based on the novels by Stephenie Meyer.  The main stars of the films are Kristen Stewart as Bella Swan, Robert Pattinson as Edward Cullen, and Taylor Lautner as Jacob Black.  "Twilight" (2008) is based on the "New York Times" best selling novel of the same name (2005) and was directed by Catherine Hardwicke.  The second film, "" (2009) is based on the first book's sequel (2006).  It was directed by Chris Weitz.  The third film, "", directed by David Slade, was released on June 30, 2010.  and is based on the third installment in the series (2007).  The filming of Breaking Dawn pt 1 started on November 1, 2010.  The Twilight Saga: Breaking Dawn – Part 1 (commonly referred to as Breaking Dawn – Part 1) released in theatres on November 18, 2011, and released to DVD on February 11, 2012 in the United States.  The film grossed over $712 million worldwide.  The Twilight Saga: Breaking Dawn – Part 2 (commonly referred to as Breaking Dawn – Part 2) was released on November 16, 2012, by Lionsgate in the United States, in consequence of the merger between Lionsgate and Summit Entertainment.  The film (101 days in release) was a box-office success, grossing over $829 million worldwide, becoming the 34th highest-grossing film, the 6th highest-grossing film of 2012 and the highest-grossing film of the Twilight series. The Twilight Saga: Breaking Dawn – Part 1 (soundtrack) Twilight (stylized as twilight) (2005) is a young adult vampire-romance novel by author Stephenie Meyer.  It is the first book in the "Twilight" series, and introduces seventeen-year-old Isabella "Bella" Swan, who moves from Phoenix, Arizona to Forks, Washington.  She is endangered after falling in love with Edward Cullen, a vampire.  Additional novels in the series are "New Moon", "Eclipse", and "Breaking Dawn". The Twilight Saga: Breaking Dawn – Part 2 (soundtrack) The Twilight Saga: Breaking Dawn – Part 1 (commonly referred to as Breaking Dawn: Part 1) is a 2011 American romantic fantasy film directed by Bill Condon and based on the novel "Breaking Dawn" by Stephenie Meyer.  The first part of a two-part film forms the fourth and penultimate installment in "The Twilight Saga" film series, and is the beginning of the 2012 film "".  All three main cast members, Kristen Stewart, Robert Pattinson, and Taylor Lautner, reprised their roles. "It Will Rain" is a song recorded by American singer and songwriter Bruno Mars.  It was released exclusively on iTunes on September 27, 2011 by Atlantic Records as the lead single from the soundtrack of the film, .  Mars composed the song with his production team The Smeezingtons, and it was partially written during The Doo-Wops & Hooligans Tour in the United States, being finished after the singer watched an early version of the movie which inspired him.  The soundtrack for The Twilight Saga: Breaking Dawn – Part 1 was a much expected release and Mars' song was chosen as the lead single by the album's executive producer, Alexandra Patsavas, to promote it.  Musically, "It Will Rain" is a pop and [[pop-soul] [[ballad]].  Its lyrics tell the agony and torment of a heartbreak and its various stages. Stephenie Meyer (née Morgan; ; born December 24, 1973) is an American young adult fiction writer and film producer, best known for her vampire romance series "Twilight".  The "Twilight" novels have gained worldwide recognition and sold over 100 million copies, with translations into 37 different languages.  Meyer was the bestselling author of 2008 and 2009 in America, having sold over 29 million books in 2008, and 26.5 million books in 2009.  "Twilight" was the best-selling book of 2008 in US bookstores.
Answer: Stephenie Meyer