Alan Turing (nonfiction)

Alan Turing (1930s).

Alan Mathison Turing, OBE, FRS (/ˈtjʊərɪŋ/; 23 June 1912 – 7 June 1954) was a British pioneering computer scientist, mathematician, logician, cryptanalyst and theoretical biologist.

He was highly influential in the development of computer science (nonfiction), providing a formalisation of the concepts of algorithm and computation with the Turing machine, which can be considered a model of a general purpose computer.

Turing is widely considered to be the father of theoretical computer science and artificial intelligence.

During the Second World War, Turing worked for the Government Code and Cypher School (GC&CS) at Bletchley Park, Britain's codebreaking centre.

For a time he led Hut 8, the section responsible for German naval cryptanalysis.

He devised a number of techniques for breaking German ciphers, including improvements to the pre-war Polish bombe method and an electromechanical machine that could find settings for the Enigma machine.

Turing played a pivotal role in cracking intercepted coded messages that enabled the Allies to defeat the Nazis in many crucial engagements, including the Battle of the Atlantic; it has been estimated that this work shortened the war in Europe by as many as two to four years.

After the war, he worked at the National Physical Laboratory, where he designed the ACE, among the first designs for a stored-program computer.

On February 19, 1946, Turing presented the "Proposal for the Development in the Mathematics Division of an Automatic Computing Engine (ACE) to a meeting of the Executive Committee of the National Physical Laboratory (NPL) in Teddington, England: the proposal was approved at a second meeting held a month later.

In 1948 Turing joined Max Newman's Computing Laboratory at the University of Manchester, where he helped develop the Manchester computers and became interested in mathematical biology.

He wrote a paper on the chemical basis of morphogenesis, and predicted oscillating chemical reactions such as the Belousov–Zhabotinsky reaction, first observed in the 1960s.

Turing was prosecuted in 1952 for homosexual acts, when such behaviour was still a criminal act in the UK. He accepted treatment with DES (chemical castration) as an alternative to prison.

Turing died in 1954, 16 days before his 42nd birthday, from cyanide poisoning. An inquest determined his death as suicide, but it has been noted that the known evidence is consistent with accidental poisoning.

In 2009, following an Internet campaign, British Prime Minister Gordon Brown made an official public apology on behalf of the British government for "the appalling way he was treated". Queen Elizabeth II granted him a posthumous pardon in 2013.

In the News

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  Universal Turing machine still heartbroken, mourns for Alan.

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  Influential book proud to have influenced Alan Turing.

Fiction cross-reference

• Alan Turing
• Glyph Warden
• Dard Hunter, Glyph Warden
• Turing machine

Nonfiction cross-reference

• Turing machine (nonfiction)
• Universal Turing machine (nonfiction)

External links:

• Alan Turing @ Wikipedia