Nearly 60 years after his death, Alan Turing, the British mathematician regarded as one of the central figures in the development of the computer, received a formal pardon from Queen Elizabeth II on Monday for his conviction in 1952 on charges of homosexuality, at the time a criminal offense in Britain.
The pardon was announced by the British justice secretary, Chris Grayling, who had made the request to the queen. Mr. Grayling said in a statement that Mr. Turing, whose most remarkable achievement was helping to develop the machines and algorithms that unscrambled the supposedly impenetrable Enigma code used by the Germans in World War II, “deserves to be remembered and recognized for his fantastic contribution to the war effort and his legacy to science.”
In 2009, Prime Minister Gordon Brown issued a formal apology to Mr. Turing, calling his treatment “horrifying” and “utterly unfair.” But Mr. Cameron’s government denied him a pardon last year.
An online petition urging a pardon received more than 35,000 signatures. The campaign has also received worldwide support from scientists, including Stephen Hawking.
When Mr. Turing was convicted in 1952, he was sentenced — as an alternative to prison — to chemical castration by a series of injections of female hormones. He also lost his security clearance because of the conviction. He committed suicide by eating an apple believed to have been laced with cyanide.