Gaston Leroux wrote the original book of Phantom of the Opera, but it was later made into a film/play by Andrew Lloyd Webber, who also wrote the music for it.
Norton Juster
Yes. The Phantom wrote the opera titled "Don Juan Triumphant".
Sir Andrew Lloyd Webber is the writer of the Phantom of the Opera.
Gaston Leroux
Gaston Leroux wrote the entire Phantom of the Opera book. However, Andrew Loid Webber wrote the musical.
George Lucas
Murder She Wrote - 1984 The Phantom Killer 10-4 was released on: USA: 24 October 1993
Gaston Leroux wrote the original book.
Sir Andrew Lloyd Webber
Charles Hart and Richard Stilgoe.
George Lucas would be your best bet