Gaston Leroux

Gaston Louis Alfred Leroux was a French journalist and author of detective fiction.
In the English-speaking world, he is best known for writing the novel The Phantom of the Opera, which has been made into several film and stage productions of the same name, notably the 1925 film starring Lon Chaney, and Andrew Lloyd Webber's 1986 musical. His novel The Mystery of the Yellow Room is also one of the most famous locked room mysteries ever written.