Professor Stephen Hawking and a long list of scientists have joined the chorus of voices calling for an official pardon of Enigma codebreaker Alan Turing, in a letter to the UK's Telegraph:

We write in support of a posthumous pardon for Alan Turing, one of the most brilliant mathematicians of the modern era. He lead the team of Enigma codebreakers at Bletchley Park, which most historians agree shortened the Second World War. Yet successive governments seem incapable of forgiving his conviction for the then crime of being a homosexual, which led to his suicide, aged 41.

We urge the Prime Minister formally to forgive this British hero, to whom we owe so much as a nation, and whose pioneering contribution to computer sciences remains relevant even today. To those who seek to block attempts to secure a pardon with the argument that this would set a precedent, we would answer that Turing's achievements are sui generis. It is time his reputation was unblemished.

Lord Currie of Marylebone
Lord Grade of Yarmouth
Lord Faulkner or Worcester
Lord Rees of Ludlow
Astronomer Royal
Lord Sharkey
Lord Smith of Finsbury
Baroness Trumpington
Sir Timothy Gowers
Rouse Ball Professor of Mathematics, Cambridge University
Dr Douglas Gurr
Chairman, Science Museum Group
Professor Stephen Hawking
Sir Paul Nurse
President, the Royal Society

During World War II, Alan Turing, who is known as the father of modern computing, devised the Turing Bombe, a codebreaking device that was used to decipher the Nazi enigma codes, up to 3,000 messages per day. He was also gay, and two years after being convicted of "gross indecency" for being homosexual and sentenced to undergo hormone therapy, he killed himself with a cyanide-laced apple.