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Creator: Alan Turing
Alan Turing OBE FRS (1912-1954) was a British computer scientist. He is the Trope Namer for Turing Test.

Turing was a hero of WWII, devising cryptanalytical techniques, including those that cracked the ENIGMA machine, helping the Allied war effort immeasurably. After the war, his efforts provided much of the foundation of twentieth century computing.

In 1936, Turing went to Princeton University in America, returning to England in 1938. He began to work secretly part-time for the British cryptanalytic department, the Government Code and Cypher School. On the outbreak of war he took up full-time work at its headquarters, Bletchley Park.

Here he played a vital role in deciphering the messages encrypted by the German Enigma machine, which provided vital intelligence for the Allies. He took the lead in a team that designed a machine known as a bombe that successfully decoded German messages. He became a well-known and rather eccentric figure at Bletchley.

After the war, Turing turned his thoughts to the development of a machine that would logically process information. He worked first for the National Physical Laboratory (1945-1948). His plans were dismissed by his colleagues and the lab lost out on being the first to design a digital computer. It is thought that Turing's blueprint would have secured them the honour, as his machine was capable of computation speeds higher than the others. In 1949, he went to Manchester University where he directed the computing laboratory and developed a body of work that helped to form the basis for the field of artificial intelligence. In 1951 he was elected a fellow of the Royal Society.

In 1952, Turing was prosecuted for homosexuality a crime at the time under the charge of Gross Indecency. Rather than face a prison sentence, Turing underwent chemical castration by the injection of synthetic oestrogen. In 1954, Turing was found dead, an autopsy showed the cause to be cyanide poisoning and it was ruled a suicide. Predictably speculation lingers on whether it was suicide, murder, or accident from sloppy chemical work. Curiously a half-eaten apple was found at the scene but was never tested.

The British government in response to a successful petition officially apologized for the way he was treated in 2009, and he received a royal pardon on Christmas Eve, 2013. Very rare in the British justice system which normally handles such cases by other means this is only the fourth use of the royal prerogative of mercy granted since WWII.

For Turing's proof of the undecidability of the Halting Problem, see this poem.

Media Featuring Alan Turing includes:

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alternative title(s): Alan Turing
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