The Redsin Tower is a 2006 horror film by Toetag Pictures.
 It is directed by Fred Vogel.
 It is their third feature film.
 Unlike their previous films, the "August Underground" series, the film has a more traditional narrative.
 "The Redsin Tower" is noteworthy of its use of excessive gore, violence and psychological horror.
Bram Stoker's Dracula's Curse (also known simply as Dracula's Curse) is a 2006 horror film by The Asylum, written and directed by Leigh Scott.
 Despite featuring Bram Stoker's name in the title, the film is not directly based on any of his writings or a mockbuster to the 1992 film "Bram Stoker's Dracula", but shares similarities to films such as "", "Dracula 2000", "" and "Van Helsing".
 The film also shares some similarities with the 1971 Hammer horror film "Countess Dracula", which also features a Dracula-esque femme fatale in the lead role.
Night of the Living Dead 3D or Night of the Living DE3D is a 2006 horror film made in 3D.
 It is the second remake of the 1968 horror classic "Night of the Living Dead".
 The first remake was released in 1990 and was directed by Tom Savini from a revised screenplay by George A. Romero.
 Unlike the first remake, no one involved with the original is involved with this version.
 The original film was never properly copyrighted, and so it has fallen into the public domain, making this remake possible with no permission from the original's creators (the original movie can actually be seen playing on TV in this version).
Driftwood is a 2006 horror film that was shown at the Screamfest LA International Horror Film Festival on October 20, 2006.
 The film was released on DVD on November 13, 2007.
 Driftwood was directed by Tim Sullivan and starring Raviv Ullman and Diamond Dallas Page.
Snakes on a Train is a 2006 direct-to-video action horror film released by The Asylum as a mockbuster on August 15, 2006.
 Many aspects of the film are inspired by the film "Snakes on a Plane", which was scheduled for theatrical release three days later on August 18, 2006.
The Hillside Strangler is a 2004 crime horror film directed by Chuck Parello and written by Stephen Johnston, based on the true story of Kenneth Bianchi and Angelo Buono Jr., the Hillside Strangler serial killers.
 The film stars C. Thomas Howell as Bianchi and Nicholas Turturro as Buono.
Paranormal Entity is a 2009 American supernatural horror film written, directed by and starring Shane Van Dyke and produced by The Asylum in 2009.
 It is one of many films dubbed as a "mockbuster", a movie designed to capitalize on the success of a more popular film.
 "Paranormal Entity" is a copycat of the successful low-budget horror film "Paranormal Activity".
 The film was followed by indirect sequels "" (also known as "Paranormal Entity 2") in 2010, "" (also known as "Paranormal Entity 3") in 2011, and "" (also known as "Paranormal Entity 4") in 2012.
Vampires vs. Zombies is an independent horror film loosely based upon J. Sheridan Le Fanu's classic 1872 novel "Carmilla".
 Unlike Le Fanu's story, however, most of the action in the film takes place inside a car.
 The title and the cover were obviously inspired by the horror film "Freddy vs. Jason", it's unclear if it was intended as a mockbuster of that film or not.
The Hills Have Eyes is a 2006 American horror film and remake of Wes Craven's 1977 film of the same name.
 Written by filmmaking partners Alexandre Aja and Grégory Levasseur of the French horror film "Haute Tension", and directed by Aja.
 The film follows a family that is targeted by a group of murderous mutants after their car breaks down in the desert.
Hillside Cannibals is a 2006 American horror film directed by Leigh Scott and produced by The Asylum.
 The film is a mockbuster of the film "The Hills Have Eyes", another film released around the same month, but its plot also incorporates elements from other films, including "Cannibal Holocaust", "The Texas Chainsaw Massacre" and "House of 1000 Corpses".

Question: Who wrote the 2006 horror film of which "Hillside Cannibals" is a mockbuster?
Answer: Aja and Grégory Levasseur