Douglas Noël Adams (11 March 1952 – 11 May 2001) was an English author, humorist, and screenwriter, best known for The Hitchhiker's Guide to the Galaxy. Originally a 1978 BBC radio comedy, The Hitchhiker's Guide to the Galaxy developed into a "trilogy" of five books that sold more than 15 million copies in his lifetime. It was further developed into a television series, several stage plays, comics, a video game, and a 2005 feature film. Adams's contribution to UK radio is commemorated in The Radio Academy's Hall of Fame.

Adams also wrote Dirk Gently's Holistic Detective Agency (1987) and The Long Dark Tea-Time of the Soul (1988), and co-wrote The Meaning of Liff (1983), The Deeper Meaning of Liff (1990), and Last Chance to See (1990). He wrote two stories for the television series Doctor Who, co-wrote City of Death (1979), and served as script editor for its seventeenth season. He co-wrote the sketch "Patient Abuse" for the final episode of Monty Python's Flying Circus. A posthumous collection of his selected works, including the first publication of his final (unfinished) novel, was published as The Salmon of Doubt in 2002.

Adams was a self-proclaimed "radical atheist", an advocate for environmentalism and conservation, and a lover of fast cars, technological innovation and the Apple Macintosh.

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