Alan Turing
Alan Turing was a British mathematician and computer scientist whose codebreaking work during World War II and foundational theories of computation helped shape modern computer science.
Codebreaking work that historians credit with shortening World War II by years brought Turing little recognition in his own lifetime, and instead led to a prosecution that shadowed his final years.
The Turing Machine
Before the war, Turing had already made a landmark theoretical contribution to mathematics with his concept of the "Turing machine," a theoretical model describing computation in the abstract that remains foundational to computer science to this day.
Breaking the Enigma Code
During World War II, Turing worked at Britain's codebreaking center at Bletchley Park, where he played a pivotal role in breaking Germany's Enigma code, developing an electromechanical device called the "Bombe" that dramatically accelerated the codebreaking process.
Shortening the War
Historians widely credit Turing's codebreaking work with significantly shortening World War II, with some estimates suggesting it saved millions of lives by allowing the Allies to anticipate German military movements and shipping routes.
Persecution and Tragedy
Despite his wartime contributions, Turing was prosecuted in 1952 under British laws criminalizing homosexuality, then sentenced to chemical castration as an alternative to imprisonment. He died in 1954 from cyanide poisoning, ruled a suicide, though some historians have since questioned the circumstances.
Posthumous Recognition
Turing received a formal royal pardon from Queen Elizabeth II in 2013, and subsequent legislation known as the "Turing Law" posthumously pardoned other men convicted under similar historical laws. He is now widely celebrated as a founding figure of computer science and artificial intelligence.
