Question: How to Train Your Dragon includes a 2014 short film directed by whom?

Context paragraphs:
How to Train Your Dragon (franchise): How to Train Your Dragon franchise (also referred to as simply HTTYD) from DreamWorks Animation consists of two feature films "How to Train Your Dragon" (2010) and "How to Train Your Dragon 2" (2014), with a third and final planned for a 2019 release.  The franchise is loosely based on the British book series by Cressida Cowell.  The franchise also consists of four short films: "Legend of the Boneknapper Dragon" (2010), "Book of Dragons" (2011), "Gift of the Night Fury" (2011) and "Dawn of the Dragon Racers" (2014).  A television series following the events of the first film, "", began airing on Cartoon Network in September 2012.  Its second season was renamed "Dragons: Defenders of Berk".  Set several years later, and as a more immediate prequel to the second film, a new television series, titled "Dragons: Race to the Edge", aired on Netflix in June 2015.  The second season of the show was added to Netflix in January 2016 and a third season in June 2016.  A fourth season aired on Netflix in February 2017 and a fifth season in August 2017.

Zara (2014 film): Zara is a 2014 short film directed by Preshanthan Moodley and written and produced by Shahrina Ramphaul.  The movie is based on a true story of a submissive, abused woman and her promiscuous, abusive husband and stars Shahrina Ramphaul as the protagonist Zara.  The movie was shot over a weekend for a paltry budget of ZAR 75,000.  It was released on DVD by the Durban based distributor AA Video.

Polaroid (film): Polaroid is upcoming 2017 American horror film directed by Lars Klevberg, based on his 2014 short film of the same name.  The feature film is produced by Roy Lee and Dimension Films and is now scheduled for release on December 1, 2017 in order to give way for "Leap! "

Dawn of the Dragon Racers: Dawn of the Dragon Racers is a 2014 computer-animated short film by DreamWorks Animation and directed by Elaine Bogan and John Sanford.  Based on the film series of the same name.  It was directed by John Sanford and Elaine Bogan, and it features the voices of Jay Baruchel and America Ferrera along with the cast from the television series.  In the short, a hunt for a lost sheep turns into a competition between Hiccup and his friends for the first title of Dragon Racing Champion of Berk.

Fixed (film): Fixed is a 2014 short comedy film directed by Codey Wilson and Burleigh Smith.  It features Amara Harnisch as Jemimah, a little girl who wants her dog to have puppies.  The film premiered at Tropfest, the world's largest short film festival.

From the Sky (film): From the Sky is a 2014 short film written and directed by Ian Ebright, who also produced it with Jess Grant.  The independently produced drama features an Arab father and son traveling through a region that often experiences drone strikes.  The film premiered at the Newport Beach Film Festival on April 30 , 2014 and was released on the video-sharing website Vimeo on October 21 , 2014.

The Gunfighter (2014 film): The Gunfighter is a 2014 short film directed by Eric Kissack.  A twist on the Western genre, the film concerns a group of people in a saloon who, in an act of breaking the fourth wall, are able to hear the narrator of the film.

Liyana Yus: Liyana Yus (born 15 May 1993) is a Bruneian actress.  Her international recognition is largely attributed to her role in Yasmine which had its worldwide release at the 2014 Shanghai International Film Festival China 2014 followed by screenings in other major markets around the world.  She also starred in the 2014 Short Film 'Mentari', part of an anthology of films for Women's Day Ikal Mayang.

Kristina Reed: Kristina Reed is an American film producer, primarily of animated films, especially the ones by DreamWorks Animation and Walt Disney Animation Studios.  She won the Academy Award for Best Animated Short Film at the Academy Award for Best Animated Short Film for the 2014 short film "Feast" at the 87th Academy Awards in 2015.

Henchmen (film): Henchmen is an upcoming Canadian/American animated action comedy film directed by Adam Wood and co-written by Wood, David Ray and Jay D. Waxman, based on Wood's own 2014 short film "Henchmen: Ill Suited."  The film stars James Marsden, Thomas Middleditch, Rosario Dawson, Alfred Molina, Nathan Fillion, Jane Krakowski, Rob Riggle, Craig Robinson and Will Sasso.  Production began in May 2015 in British Columbia.  Produced by Bron Studios, it was planned to be released in 2016.

Supporting paragraphs: How to Train Your Dragon (franchise) Dawn of the Dragon Racers
Answer: Elaine Bogan and John Sanford