What author inspired American musical fantasy film Willy Wonka & the Chocolate Factory?
Willy Wonka &amp; the Chocolate Factory:  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. Charlie and the Chocolate Factory: Charlie and the Chocolate Factory is a 1964 children's novel by British author Roald Dahl.
Roald Dahl