Question: Grégory Levasseur produced the 2003 horror film directed by whom?

Context paragraphs:
The Pyramid (film): The Pyramid is a 2014 American horror film directed by Grégory Levasseur, produced by Alexandre Aja, and distributed by 20th Century Fox.  It is presented as found footage documenting the exploration of a recently discovered pyramid by a team of archaeologists.  Written by Daniel Meersand and Nick Simon, the film stars Ashley Hinshaw, Denis O'Hare, James Buckley and Daniel Amerman.  "The Pyramid" was released on December 5, 2014, and was negatively received by critics.

Strange Things Happen at Sundown: Strange Things Happen at Sundown is a 2003 horror comedy, centering on the lives of a handful of New York vampires.  It was directed by Marc Fratto and produced by Insane-o-rama Productions, and picked up for distribution by Brain Damage Films.  The film won the audience choice award at the 2003 New York City Horror Film Festival and has received generally favorable reviews.

The Hills Have Eyes (2006 film): 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.

Grégory Levasseur: Grégory Levasseur (born 1979 in Douarnenez, France) is a French screenwriter and film producer, best known for "The Hills Have Eyes" (2006), "High Tension" (2003), "Maniac" (2012) "Piranha 3-D" (2010), "Mirrors" (2008), "P2" (2007), and "Furia" (1999), all of which he collaborated on with Alexandre Aja.

High Tension: High Tension (French: Haute Tension, ] ; released in the United Kingdom as Switchblade Romance) is a 2003 French horror film directed by Alexandre Aja, stars Cécile de France, Maïwenn, and Philippe Nahon.

LD 50 Lethal Dose: LD 50 Lethal Dose was a 2003 horror film directed by Simon De Selva, produced by Alistair MacLean-Clark and Basil Stephens and written by Matthew McGuchan.  A group of animal rights activists set off to free an imprisoned colleague from a terrifying ordeal but their rescue mission turns into a series of twisted and mind bending incidents.  Starring Tom Hardy, Katharine Towne and Melanie Brown.

Furia (film): Furia is a 1999 French romantic drama film directed by Alexandre Aja, who co-wrote screenplay with Grégory Levasseur, adapted from the science fiction short story "Graffiti" by Julio Cortázar.  It stars Stanislas Merhar and Marion Cotillard.

Maniac (2012 film): Maniac is a 2012 French-American psychological slasher film directed by Franck Khalfoun and written by Alexandre Aja, Grégory Levasseur, and C.A. Rosenberg.  The film was produced by the French film companies La Petite Reine and Studio 37.  It is a remake of the 1980 film "Maniac" and stars Elijah Wood as Frank Zito, a brutal serial killer.  The film also stars Nora Arnezeder, Jan Broberg, and America Olivo.

Alexandre Aja: Alexandre Aja (born 7 August 1978) is a French film director best known for his work in various horror films.  Aja rose to international stardom for his 2003 horror film "Haute Tension" (known as "High Tension" in the US and "Switchblade Romance" in the UK).  He has also directed the horror films "The Hills Have Eyes" (2006), "Mirrors" (2008), "Piranha 3D" (2010) and "Horns" (2013).

P2 (film): P2 is a 2007 American-Canadian horror thriller film directed by Franck Khalfoun; written and produced by Khalfoun, Alexandre Aja and Grégory Levasseur; and starring Rachel Nichols and Wes Bentley.  The trio of Khalfoun, Aja and Levasseur also worked on the 2006 film "The Hills Have Eyes".

Supporting paragraphs: Grégory Levasseur High Tension
Answer: Alexandre Aja