The Big Lebowski is a 1998 British-American crime comedy film written, produced, and directed by Joel and Ethan Coen.
 It stars Jeff Bridges as Jeffrey "The Dude" Lebowski, a Los Angeles slacker and avid bowler.
 He is assaulted as a result of mistaken identity, after which The Dude learns that a millionaire also named Jeffrey Lebowski was the intended victim.
 The millionaire Lebowski's trophy wife is kidnapped, and he commissions The Dude to deliver the ransom to secure her release; but the plan goes awry when the Dude's friend Walter Sobchak (John Goodman) schemes to keep the ransom money.
 Julianne Moore and Steve Buscemi also star, with David Huddleston, John Turturro, Philip Seymour Hoffman, Sam Elliott, Tara Reid, David Thewlis and Flea appearing in supporting roles.
Bedknobs and Broomsticks is a 1971 British-American musical fantasy film produced by Walt Disney Productions and released by Buena Vista Distribution Company in North America on December 13, 1971.
 It is based upon the books "The Magic Bedknob; or, How to Become a Witch in Ten Easy Lessons" (1943) and "Bonfires and Broomsticks" (1945) by English children's author Mary Norton.
 The film, which combines live action and animation, stars Angela Lansbury and David Tomlinson.
Dragonheart is a 1996 British-American fantasy action-adventure film directed by Rob Cohen.
 It stars Dennis Quaid, David Thewlis, Pete Postlethwaite, Dina Meyer, and the voice of Sean Connery.
 It was nominated for the Academy Award for Best Visual Effects and various other awards in 1996 and 1997.
James and the Giant Peach is a 1996 British-American musical fantasy film directed by Henry Selick, based on the 1961 novel of the same name by Roald Dahl.
 It was produced by Tim Burton and Denise Di Novi, directed by Henry Selick, and starred Paul Terry as James.
 The film is a combination of live action and stop-motion animation.
 Co-stars Joanna Lumley and Miriam Margolyes played James's aunts in the live-action segments, and Simon Callow, Richard Dreyfuss, Susan Sarandon, Jane Leeves, David Thewlis, and Margoyles voiced his insect friends in the animation sequences.
American Buffalo is a 1996 British-American drama film directed by Michael Corrente and starring Dustin Hoffman, Dennis Franz, and Sean Nelson, the only members of the cast.
 The film is based on David Mamet's 1975 play of the same name.
David Thewlis (born David Wheeler; born 20 March 1963) is an English actor, director, screenwriter, and author.
 His most commercially successful role to date has been that of Remus Lupin in the "Harry Potter" film series.
 Other notable performances include the films "Naked" (for which he won the Best Actor award at Cannes Film Festival), "Dragonheart", "Kingdom of Heaven", "The Boy in the Striped Pyjamas", "The Theory of Everything", "Black Beauty", "Macbeth" (as King Duncan) and "Wonder Woman".
 He has also done voice work in the films "James and the Giant Peach" (1996), "The Miracle Maker" (2000), and "Anomalisa" (2015).
 Thewlis has combined major motion picture work with prominent television roles, including playing Cyrus Crabb in the television miniseries "Dinotopia" and antagonist V.M. Varga in the third season of "Fargo."
Naked is a 1993 British black comedy-drama film written and directed by Mike Leigh and starring David Thewlis as Johnny, a motor-mouthed intellectual and conspiracy theorist.
 Stark and brutal in tone, "Naked" was a departure for Leigh, whose previous works were known for their subtle comedic dissections of middle-class and working-class manners.
 Leigh's "Naked" screenplay relied heavily on lengthy improvisation during rehearsals, but little actual ad-libbing was filmed.
 Critically acclaimed, the film won a number of awards, including best director and best actor at Cannes.
 "Naked" marked a new career high for Leigh as a director and made the then-unknown Thewlis an internationally recognized star.
Black Beauty is a 1994 film adaptation of Anna Sewell's novel by the same name directed by Caroline Thompson in her directorial debut.
 The film stars Andrew Knott, Sean Bean and David Thewlis.
 The film is also treated as an autobiography of the horse Black Beauty as in the original novel, and is narrated by Alan Cumming as the voice of the 'Black Beauty'.
 This is the fifth feature film adaptation of the 1877 classic novel by Anna Sewell.
The English Patient is a 1996 British-American war drama film directed by Anthony Minghella from his own script based on the novel of the same name by Michael Ondaatje and produced by Saul Zaentz.
The Boy in the Striped Pyjamas (released as The Boy in the Striped Pajamas in the United States; see spelling differences) is a 2008 British-American historical period drama based on the novel of the same name by Irish writer John Boyne.
 Directed by Mark Herman, produced by BBC Films and Heyday Films, and distributed by Miramax (North America) and Walt Disney Studios Motion Pictures (International), the film stars Vera Farmiga, David Thewlis, Asa Butterfield, and Jack Scanlon.
 It was released on 12 September 2008 in the United Kingdom.

Question: On whose novel was a 1996 British-American musical fantasy for which David Thewlis did voice work for based?
Answer: Roald Dahl