Question: What author inspired American musical fantasy film Willy Wonka & the Chocolate Factory?

Context articles: The Candy Man
Pure Imagination
Wonka Bar
Charlie and the Chocolate Factory (film)
The Willy Wonka Candy Company
Inside Charlie's Chocolate Factory
Willy Wonka &amp; the Chocolate Factory
Charlie and the Chocolate Factory
The Scarecrow (2013 film)
Roald Dahl's Willy Wonka (musical)

"The Candy Man" (or alternatively, "The Candy Man Can") is a song which originally appeared in the 1971 film "Willy Wonka & the Chocolate Factory".
 It was written by Leslie Bricusse and Anthony Newley specifically for the film.
 Although the original book by Roald Dahl ("Charlie and the Chocolate Factory") contains lyrics adapted for other songs in the film, the lyrics to "The Candy Man" do not appear in the book.
 The soundtrack version of the song was sung by Aubrey Woods, who played Bill the candy store owner in the film.
"Pure Imagination" is a song from the 1971 movie "Willy Wonka & the Chocolate Factory".
 It was written by British composers Leslie Bricusse and Anthony Newley specifically for the movie.
 It was sung by Gene Wilder (Willy Wonka).
 The intro of the song, which also is the musical code for entering the Chocolate Room played by Willy Wonka, is the introduction of Wolfgang Amadeus Mozart's "Marriage of Figaro".
The Wonka Bar is both a fictional candy bar, introduced as a key story point in the 1964 novel "Charlie and the Chocolate Factory" by Roald Dahl, and a type of consumer product candy bar inspired by the fictional confection.
 Wonka Bars appear in both film adaptations of the novel, "Willy Wonka & the Chocolate Factory" (1971) and "Charlie and the Chocolate Factory" (2005), and the play "Charlie and the Chocolate Factory the Musical" (2013) each with different packaging.
Charlie and the Chocolate Factory is a 2005 musical fantasy film directed by Tim Burton and written by John August, based on the 1964 British novel of the same name by Roald Dahl.
 The film stars Johnny Depp as Willy Wonka and Freddie Highmore as Charlie Bucket.
 The storyline follows Charlie, who wins a contest and is along with four other contest winners, subsequently led by Wonka on a tour of his chocolate factory, the most magnificent in the world.
The Willy Wonka Candy Company is a British brand of confectionery owned and licensed by Swiss corporation Nestlé.
 The Wonka brand's inception comes from materials licensed from British author Roald Dahl.
 His classic children's novel, "Charlie and the Chocolate Factory", and its film adaptations are the source of both the packaging and the marketing styles of the Wonka brand.
 The brand was launched in 1971, coinciding with the release of the novel's first film adaptation.
 In 1988 the Willy Wonka Candy Company brand – then owned by Sunmark Corporation – was acquired by Nestlé.
 Nestlé sells sweets and chocolate under the Willy Wonka brand name in the United States, Canada, the United Kingdom, the Republic of Ireland, Australia, New Zealand, Japan, South Africa, Mexico, Colombia, Brazil, Argentina, Costa Rica, Panama, Dominican Republic and the Middle East.
 In mid-2015 the Willy Wonka brand name was dropped by Nestlé, in favour of special "throwback" packaging.
 Candies previously made by the Willy Wonka brand are now under the Nestlé brand naming, excluding the Wonka brand name on the top left corner.
Inside Charlie's Chocolate Factory: The Complete Story of Willy Wonka, the Golden Ticket, and Roald Dahl's Most Famous Creation is a 2014 non-fiction book by Lucy Mangan.
 It was released at the same time as the 50th anniversary edition of "Charlie and the Chocolate Factory" and looks at the origin and history of that story.
Willy Wonka & the Chocolate Factory is a 1971 American musical fantasy film directed by Mel Stuart, and starring Gene Wilder as Willy Wonka.
 It is an adaptation of the 1964 novel "Charlie and the Chocolate Factory" by Roald Dahl.
 Dahl was credited with writing the film's screenplay; however, David Seltzer, who went uncredited in the film, was brought in to re-work Dahl's screenplay against his wishes, making major changes to the ending and adding musical numbers.
 These changes and other decisions made by the director led Dahl to disown the film.
Charlie and the Chocolate Factory is a 1964 children's novel by British author Roald Dahl.
 The story features the adventures of young Charlie Bucket inside the chocolate factory of eccentric chocolatier Willy Wonka.
The Scarecrow is a 2013 animated short film and advertisement by the American restaurant chain Chipotle Mexican Grill.
 The film features Fiona Apple singing a cover version of "Pure Imagination", originally performed by Gene Wilder as Willy Wonka in the 1971 film "Willy Wonka & the Chocolate Factory".
Roald Dahl's Willy Wonka is a musical that combines elements of both Roald Dahl's book "Charlie and the Chocolate Factory" and of the 1971 movie "Willy Wonka & the Chocolate Factory" with newly created material.
 The musical has several versions: the original version which premiered in 2004, the Junior version, the Kids version, and the Theatre for Young Audiences version.
 All are owned by Music Theatre International, the company that owns the Willy Wonka license.