Douglas Noel Adams (11 March 1952 – 11 May 2001) was an English author, humourist, and screenwriter, best known for The Hitchhiker's Guide to the Galaxy (HHGTTG). 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.

In 1980, Adams began attempts to turn the first Hitchhiker's novel into a film, making several trips to Los Angeles, and working with Hollywood studios and potential producers. The next year, the radio series became the basis for a BBC television mini-series broadcast in six parts. When he died in 2001 in California, he had been trying again to get the film project started with Disney, which had bought the rights in 1998. The screenplay got a posthumous re-write by Karey Kirkpatrick, and the resulting film was released in 2005.

Adams died of a heart attack due to undiagnosed coronary artery disease on 11 May 2001, aged 49, after resting from his regular workout at a private gym in Montecito, California. His funeral was held on 16 May in Santa Barbara. His ashes were placed in Highgate Cemetery in north London in June 2002. A memorial service was held on 17 September 2001 at St Martin-in-the-Fields church, Trafalgar Square, London., even though Adams was an athiest!

Two days before Adams died, the Minor Planet Center announced the naming of asteroid 18610 Arthurdent, named after The Hitchhiker's Guide to the Galaxy protagonist. In 2005, the asteroid 25924 Douglasadams was named in his memory.

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