Alan Turing: computing pioneer, codebreaker, gay icon

Today, the 23rd of May, marks exactly one month until the centenary of Alan Turing’s birth. Events have been going on, and will continue to go on, through the whole of this year to celebrate the milestone. You may have seen that next month’s Skepchick Book Club book will be David Leavitt’s biography of Turing, but you may not know much about the man himself – much less about why he warrants a whole year of recognition. As Queereka’s resident Turing geek (official title) I hope I’ll be able to demonstrate what an important figure Turing was, the enormous debt we owe him, and the injustices he faced as a gay man living in the wrong time. Of course, I won’t be able to cover every facet of him, which is why you should definitely join in with next month’s discussion!

Alan Mathison Turing was born on the 23rd of June 1912 to an upper-middle class British family. It didn’t take long for him to show signs of brilliance. As a teenager he attended Sherborne School, where his scientific talents weren’t appreciated by the more classics-focused teachers, leading him to work on them in his own time (including extrapolating Einstein’s doubts about Newton’s laws of motion, completely independently, at the age of sixteen). It was also here that he met and fell in love with a fellow student named Christopher Morcom. Sadly, Morcom died suddenly of tuberculosis near the end of their schooling – it was this event that turned Turing into an atheist and arguably helped shape the rest of his life.

Having won a scholarship to study maths at King’s College Cambridge, Turing was elected a Fellow of the college only a year after graduating with a first-class honours degree. A year after this he published perhaps his most important paper, “On Computable Numbers, with an Application to the Entscheidungsproblem“. In it he introduced what became known as Turing machines – machines capable of performing any mathematical function if it were expressed as an algorithm (a set of instructions for the machine to follow). This theory is central to computer science – in essence, Turing created the theoretical framework for computers in this paper, decades before the first digital computers were built.

If those contributions weren’t enough, Turing went on to even more great things. During the Second World War, he worked at Bletchley Park, the centre of Britain’s codebreaking efforts, where the brightest minds in the country worked together to crack German ciphers. It is believed that these efforts shortened the war by at least two years, potentially saving millions of lives.

Though what was achieved at Bletchley Park was undoubtedly a massive team effort, built upon the previous work of others including Polish cryptanalysts, Turing’s contribution was clearly vital. He shares credit with Gordon Welchman and Harold Keen for the invention of the Bombe, a machine designed to break Enigma, one of the Germans’ major methods of encryption. He worked to make previous methods of decryption more general, robust and efficient. His ideas also fed into the design of Colossus, a machine that cracked the Lorenz cipher, though he wasn’t directly involved in it.

While at Bletchley he gained a reputation as an eccentric. To combat hayfever he’d wear a gas mask while cycling to work, he chained his mug to the radiator to prevent it being stolen, and when the chain came off his bike he didn’t get it fixed. Instead, he counted the number of times the pedals went round and got off in time to adjust it. Turing was awarded an OBE for his war work, but wasn’t allowed to reveal the nature of it due it being classified – the full extent of his contributions would not become clear until after his death.


Alan Turing Memorial, Manchester

The Alan Turing Memorial in Manchester

After the war Turing worked first at the National Physical Laboratory, then the University of Manchester, on early computing machines. He also began to consider the issue of artificial intelligence, formulating the famous Turing test. This states that a computer can be said to “think” if a conversation with it cannot be told apart from a conversation with a human being. In the last two years of his life he turned his mind to mathematical biology, specifically morphogenesis (the study of how organisms develop their shapes), where his work is considered seminal.

(Did I mention he was also a world-class marathon runner? Hey, you have to balance out founding computer science with a little physical exercise.)

As you may have worked out, in addition to all of this Turing happened to be gay. While these days most people in the UK have cottoned on to the fact that being gay is not a bad thing, back then homosexuality was illegal – it was only legalised in 1967. In 1952 Turing spent the night with a young man, Arnold Murray, who was also a petty thief. This would prove to be his undoing. After their encounter Murray and an accomplice broke into Turing’s house – Turing, honest to a fault, reported the crime to the police, but in the process was forced to acknowledge his sexual relationship with Murray. They were both charged with “gross indecency”. Turing lost his security clearance and was also forced to choose between a jail sentence and chemical castration by oestrogen injections. He opted for the latter.

The treatment, which aimed to reduce libido, was humiliating, and didn’t even work as it was “meant” to – Turing’s sexual desires were unaffected, but he became impotent and grew breasts. He couldn’t run any more after his body became bloated thanks to the effect of the hormones he was required to take. Two years after his arrest, on the 7th of June 1954, Turing died aged just forty-one. He had apparently taken his own life by biting into an apple laced with cyanide. Some have speculated whether this could have been an accident, due to him not washing his hands after performing experiments, or even something more sinister – the government viewing him as a liability following his conviction and orchestrating his death. What matters, though, is that the world lost one of its greatest minds prematurely, and wouldn’t have were it not for the horrendous treatment dished out to him simply because of who he was attracted to.

While in his lifetime Turing was wholly unappreciated, since his death and since the work he did during the war has been declassified that has changed. Blue plaques punctuate the route of his life. An entire year of events relating to him have been planned all over the world, from conferences to mass sunflower planting. In 2009, then-Prime Minister Gordon Brown issued an official apology for the way Turing had been treated, saying, “We’re sorry, you deserved so much better”. There have been campaigns to officially pardon Turing and all the other men convincted of gross indecency and to get him on the next £10 note.

Sadly, despite all these gestures, the injustice remains and continues around the world in infinite guises. Perhaps the greatest tribute of all would be to work to make the world a place where no one gets intimidated, prosecuted or killed because of who they are and who they love.

Feature image from the Alan Turing Year website.

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Courtney is a theoretical physics student at Imperial College London, broadly identifying as cisfemale, panromantic, asexual and atheist. She lives with mental illness (worst room-mate ever) and hopes to help break down the stigma attached to admitting that. Her hobbies include campaigning, internetting and spectacularly failing to defy any stereotypes regarding British people and tea. She also identifies as an X-Phile/Browncoat/Whovian, which are clearly the most important things.


  1. May 23, 2012 at 12:16 pm —

    thanks for posting this! Turing’s treatment at the hands of the government to which he lent such critical aid is an absolute atrocity, and the man deserves all the recognition he can be given. i’ll be keeping my eye out for upcoming events!

    • May 24, 2012 at 11:54 am —

      It was my pleasure, thank you for reading it. Turing is definitely a hero of mine – his treatment was absolutely disgraceful even without considering his contributions.

      Hope you find some cool events! This site (and the mailing list) is a great source of information regarding what’s going on this year as part of the celebrations:

  2. May 23, 2012 at 7:27 pm —

    We are reading the same book for our Boston Skeptics Book Club… I’ve linked your post to our page.

    • May 23, 2012 at 10:52 pm —

      I believe Courtney is the one who recommended the book! =)

      Unfortunately, I won’t have the time to read it with y’all, but it’s certainly on my list of “things to read when not in graduate school.” 😉

      • May 24, 2012 at 1:03 pm —

        Thanks for the link Buzz! Glad you found it useful.

        I’m glad to hear it’s on your to-read list, Will, hope you enjoy it when you get to it. There are far too many books in the world, and far too little time…

  3. […] latest piece for Queereka, an overview of the life and works of Alan Turing, can be found here. It was also cross-posted to the main Skepchick website, where David Leavitt’s biography of […]

  4. […] June 7, 1954 – English mathematician and computer genius Alan Turing dies from cyanide poisoning. See Courtney’s wonderful post about Turing here. […]

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