Alan Turing

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Alan Turing: Life and Contributions

Alan Turing was a brilliant British mathematician, logician, and cryptanalyst, born on June 23, 1912, in London, England. He is often considered the father of modern computer science and artificial intelligence. Turing made significant contributions to various fields, including mathematics, cryptanalysis, logic, philosophy, and mathematical biology.

Education and Early Career

Turing was educated at a top private school and entered the University of Cambridge to study mathematics in 1931. After graduating in 1934, he was elected to a fellowship at King's College in recognition of his research in probability theory. Turing also studied at Princeton University.

World War II and Enigma Code

During World War II, Turing worked at Bletchley Park in Buckinghamshire, where top-secret work was carried out to decipher the military codes used by Germany and its allies. The main focus of Turing's work at Bletchley was cracking the 'Enigma' code, a type of enciphering machine used by the German armed forces to send messages securely. Turing and his colleague Gordon Welchman built on the Polish Cipher Bureau's work to develop the Bombe, a machine that replicated the rotors of the Enigma and searched through different combinations of rotor positions to test potential ciphers.

Turing Machine and Church-Turing Thesis

In the course of his work on the Entscheidungsproblem, Turing invented the universal Turing machine, an abstract computing machine that encapsulates the fundamental logical principles of the digital computer. The universal Turing machine is a mathematical model of modern computers. Turing determined that there are some mathematical problems that cannot be solved by an algorithm, placing a fundamental limit on the power of computation. This is known as the Church–Turing thesis.

Turing Test

The Turing Test, originally called the imitation game by Alan Turing in 1950, is a test of a machine's ability to exhibit intelligent behavior equivalent to, or indistinguishable from, that of a human. Turing proposed that a human evaluator would judge natural language conversations between a human and a machine designed to generate human-like responses. If the evaluator could not reliably tell the machine from the human, the machine would be said to have passed the test.

Personal Life and Death

Turing was arrested in 1952 for his homosexual relationship with a young Manchester man, which was illegal at the time. He was convicted and underwent chemical castration as part of his sentence. Turing died on June 7, 1954, from cyanide poisoning. The official verdict was suicide, but some have questioned this conclusion and suggested that his death may have been an accident.


Alan Turing's work has left a lasting impact on various fields, including computer science, artificial intelligence, and cryptography. His contributions during World War II were crucial in breaking the Enigma code, which significantly aided the Allied forces. Turing's theoretical work on the universal Turing machine and the Church-Turing thesis remain foundational research in computer science and artificial intelligence.
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