Sara Bennett is a British visual effects artist.
 Best known for her works in "Harry Potter and the Chamber of Secrets" (2002), "Harry Potter and the Prisoner of Azkaban" (2004), "Harry Potter and the Goblet of Fire" (2005), "Doctor Who" (2005), "Merlin" (2008), "Jonathan Strange & Mr Norrell" (2009), "Skellig" (2009), "The Martian" (2015) and "Ex Machina" (2015).
John Richardson (born 1946 in England) is a British special effects supervisor.
 He is best known for his work on the "James Bond" film series (at least "Casino Royale", "Moonraker", "Octopussy", "A View to a Kill" and "Die Another Day"), all the "Harry Potter" film series (2001-2011), "A Bridge Too Far" (1977) and "Aliens" (1986).
 For the latter, he won the Academy Award for Best Visual Effects at the 1987 ceremony.
 He won the BAFTA Award for Best Special Visual Effects for his work on the film "Harry Potter and the Deathly Hallows – Part 2" (2011), for which he was also nominated for an Academy Award at the 2012 ceremony.
Harry Potter and the Chamber of Secrets is a 2002 British-American fantasy film directed by Chris Columbus and distributed by Warner Bros.
 Pictures.
 It is based on the novel of the same name by J. K. Rowling.
 The film is the second instalment in the long-running "Harry Potter" film series.
 It was written by Steve Kloves and produced by David Heyman.
 Its story follows Harry Potter's second year at Hogwarts School of Witchcraft and Wizardry as the Heir of Salazar Slytherin opens the Chamber of Secrets, unleashing a monster that petrifies the school's denizens.
 The film stars Daniel Radcliffe as Harry Potter, with Rupert Grint as Ron Weasley, and Emma Watson as Hermione Granger.
 The film is also the last film to feature Richard Harris as Professor Albus Dumbledore, due to his death that same year.
Paul Norris is a British visual effects supervisor.
 Best known for his works in "Harry Potter and the Prisoner of Azkaban" (2004), "Harry Potter and the Goblet of Fire" (2005), "" (2015), and "Ex Machina" (2015).
Carey Villegas is a visual effects artist who was nominated at the 83rd Academy Awards in the category of Best Visual Effects, for the film "Alice in Wonderland".
 His nomination was shared with Sean Phillips, Ken Ralston and David Schaub.
 Also for Alice in Wonderland, Carey won the 2010 Golden Satellite Award for Best Visual Effects and was nominated for the British Academy Award (BAFTA), Critics Choice Award, Saturn Award, and the Visual Effects Society Award (VES) for "Outstanding Visual Effects in a Visual Effects Driven Motion Picture".
Harry Potter and the Goblet of Fire is a 2005 British-American fantasy film directed by Mike Newell and distributed by Warner Bros.
 Pictures.
 It is based on the novel of the same name by J. K. Rowling.
 The film, which is the fourth instalment in the "Harry Potter" film series, was written by Steve Kloves and produced by David Heyman.
 The story follows Harry Potter's fourth year at Hogwarts as he is chosen by the Goblet of Fire to compete in the Triwizard Tournament.
Nicholas Brooks (born May 20, 1964) is a British visual effects artist.
 He won at the 71st Academy Awards in the category of Best Visual Effects for his work on "What Dreams May Come".
 He shared his Oscar with Joel Hynek, Kevin Mack and Stuart Robertson.
Harry Potter and the Philosopher's Stone (released in some countries as Harry Potter and the Sorcerer's Stone) is a 2001 British-American fantasy film directed by Chris Columbus and distributed by Warner Bros.
 Pictures.
 It is based on the novel of the same name by J. K. Rowling.
 The film is the first instalment in the long-running "Harry Potter" film series, and was written by Steve Kloves and produced by David Heyman.
 Its story follows Harry Potter's first year at Hogwarts School of Witchcraft and Wizardry as he discovers that he is a famous wizard and begins his education.
 The film stars Daniel Radcliffe as Harry Potter, with Rupert Grint as Ron Weasley, and Emma Watson as Hermione Granger.
Paul Kavanagh is a British visual effects artist who was nominated at the 82nd Academy Awards in the category of Best Visual Effects for his work on "Star Trek".
 His nomination was shared with Burt Dalton, Russell Earl and Roger Guyett.
Andrew Whitehurst is a British visual effects artist.
 Best known for his works in "Troy" (2004), "Charlie and the Chocolate Factory" (2005), "Harry Potter and the Order of the Phoenix" (2007) and "Ex Machina" (2015).

Question: Who was the British visual effects artist for the fourth instalment in the "Harry Potter" film series?
Answer: Sara Bennett