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Alan Mathison Turing (23 June 1912 – 7 June 1954) was a mathematician, logician, cryptanalyst and computer scientist. He was influential in the development of computer science and providing a formalisation of the concept of the algorithm and computation with the Turing machine, playing a significant role in the creation of the modern computer.

During World War II, Turing worked at Bletchley Park, Britain's codebreaking centre, devising techniques for breaking German ciphers, including the method of the bombe, an electromechanical machine that could find settings for the Enigma machine. He later worked at the National Physical Laboratory, creating one of the first designs for a stored-program computer, the ACE. He joined the University of Manchester in 1948, developing software for the Manchester Mark 1.

Turing's homosexuality resulted in criminal prosecution in 1952. As an alternative to imprisonment, he accepted chemical castration. He committed suicide at his home in Wilmslow in 1954. In 2009, Gordon Brown officially apologised on behalf of the government for Turing's treatment, and in 2013, Turing was granted a royal pardon. The Bank of England announced in 2019 that Turing's portrait will appear on the £50 note.

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