William Peter Blatty was an American writer, director and producer. He is best known for his 1971 novel, The Exorcist, and for his 1973 screenplay for the film adaptation of the same name. Blatty won an Academy Award for Best Adapted Screenplay for The Exorcist, and was nominated for Best Picture as its producer. The film also earned Blatty a Golden Globe Award for Best Motion Picture – Drama as producer.

The Academy Award for Best Adapted Screenplay is the Academy Award for the best screenplay adapted from previously established material. The most frequently adapted media are novels, but other adapted narrative formats include stage plays, musicals, short stories, TV series, and even other films and film characters. All sequels are also considered adaptations by this standard.