Question: Peter Brook and David Nixon both have what jjob title in the film industry?

Context paragraphs:
David Nixon (director): David Nixon is an American film director and film producer.  He is the director and producer of "Letters to God" and a co-producer and assistant director of "Fireproof" and "Facing the Giants".

Irina Brook: Irina Brook (b. April 5, 1962) is a British stage actress, director and producer.  The daughter of film and theater director Peter Brook and actress Natasha Parry, she was named a Chevalier des Arts et des Lettres in 2002 by the French Ministry of Culture.  Born in Paris, Brook grew up between England and France.

Peter Brook: Peter Stephen Paul Brook, CH, CBE (born 21 March 1925) is an English theatre and film director who has been based in France since the early 1970s.  He has won multiple Tony and Emmy Awards, a Laurence Olivier Award, the Praemium Imperiale, and the Prix Italia.  He has been called "our greatest living theatre director".

The Mahabharata (1989 film): The Mahabharata is a 1989 film version of the Hindu epic, "Mahabharata "directed by Peter Brook.  Brook's original 1985 stage play was 9 hours long, and toured around the world for four years.  In 1989, it was reduced to under 6 hours for television (TV mini series).  Later it was also reduced to about 3 hours for theatrical and DVD release.  The screenplay was the result of eight years' work by Peter Brook, Jean-Claude Carrière and Marie-Hélène Estienne.

Letters to God: Letters to God is a 2010 Christian drama film directed by David Nixon and starring Robyn Lively, Jeffrey Johnson, Tanner Maguire, Michael Bolten and Bailee Madison.  The story was written by Patrick Doughtie about his son Tyler, with the screenplay penned by Doughtie, Art D'Alessandro, Sandra Thrift and Cullen Douglas.  The story took place in Nashville, Tennessee, but the movie was filmed in the Orlando, Florida area.

The Mahabharata (play): The Mahabharata (French: "Le Mahabharata" ) is a French play, based on the Sanskrit epic "Mahābhārata", by Jean-Claude Carrière, which was first staged in a quarry just outside Avignon in a production by the English director Peter Brook.  The play, which is nine hours long in performance (eleven with intervals), toured the world for four years.  For two years the show was performed both in French and in English (it was translated into English by Brook in 1987).  The play is divided into three parts: "The Game of Dice", "The Exile in the Forest" and "The War".  In 1989, it was adapted for television as a six-hour mini series.  Later, it was reduced to about three hours as a film for theatrical and DVD release.  The screenplay was the result of eight years' work by Peter Brook, Jean-Claude Carrière, and Marie-Hélène Estienne.

Benefit of the Doubt (1967 film): Benefit of the Doubt is a 1967 documentary on Peter Brook's anti-Vietnam protest play, with the Royal Shakespeare Company, known under the title "US".  It was filmed at London's Aldwych Theatre and features Peter Brook, Michael Kustow, Michael Williams and Glenda Jackson.  It was directed by Peter Whitehead.

David Nixon (magician): David Nixon (29 December 1919 – 1 December 1978) was an English magician and television personality.  At the height of his career, Nixon was the best-known magician in the UK.

The Man Who (play): The Man Who: a theatrical research is the English text of this play by Peter Brook, co-authored by Marie-Hélène Estienne, and created in Paris with Brook's troupe at The Bouffes du Nord Theatre.

Battlefield (play): Battlefield is a play directed and written by Peter Brook and Marie-Hélène Estienne, based on Le Mahabharata by Brook, Estienne and Jean-Claude Carrière.  It was made and premiered in 2015 at the Young Vic in London, and featured actors Carole Karemera, Jared McNeill, Ery Nzaramba and Sean O’Callaghan.  The music was written and performed on stage by Le Mahabharata's musician Toshi Tsuchitori.

Supporting paragraphs: Peter Brook David Nixon (director)
Answer: film director