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—— ON THIS DAY ——
JUNE 23, 1954
Wilmslow, Cheshire, England
70 years ago
Alan Turing in the 1930s — photographed before the war that his work on Enigma helped win, before the 1952 prosecution for being gay, and before the death in 1954 that may have been suicide, accident, or something else entirely.
Alan Turing was found dead in his home in Wilmslow, Cheshire, on June 8, 1954. He was discovered by his housekeeper. The date of death is placed at June 7 or the evening of June 7 — he was forty-one years, six months old, and his death has been officially dated as June 23, 1954, in some accounts based on the inquest. The cause of death was cyanide poisoning. A half-eaten apple was found beside his body. The inquest recorded a verdict of suicide.
Turing had been convicted under Section 11 of the Criminal Law Amendment Act 1885 — 'gross indecency' — in March 1952, following his disclosure to police of a consensual homosexual relationship. He was offered a choice: imprisonment or chemical castration through a course of synthetic estrogen injections. He chose the injections, which caused him to develop gynaecomastia (breast tissue growth) and other physical changes. He had also been stripped of his security clearance and subjected to surveillance by the security services.
—— MARQUEE EVENT ——
The Alan Turing memorial plaque at Bletchley Park — the site where Turing's Bombe machines decoded Enigma messages at a rate that shaped the course of the Second World War.
The circumstances of Turing's death have been interpreted in several ways. The official verdict was suicide — consistent with a man who had been chemically castrated, placed under surveillance, and professionally destroyed by the government he had served. His mother maintained until her death that the cyanide inhalation was accidental — that Turing had been running chemistry experiments in his spare bedroom and had accidentally inhaled cyanide fumes. A third interpretation, proposed by some historians, is that the security services arranged his death to prevent further security risk. None of these can be definitively established.
Turing had been working in his final years on mathematical biology — specifically on how biological organisms generate their distinctive patterns, such as the spiral of a seashell or the spots of a cheetah. His 1952 paper 'The Chemical Basis of Morphogenesis' proposed that these patterns emerge from the interaction of two chemicals — an activator and an inhibitor — diffusing through tissue at different rates. The theory, now called 'Turing patterns' or 'reaction-diffusion theory,' was experimentally confirmed decades after his death and is now a central concept in developmental biology. He was working on it when he died.
The British government's posthumous treatment of Turing has been the subject of increasing recognition. Gordon Brown issued a statement of 'profound regret' in 2009. Queen Elizabeth II granted a royal pardon in 2013. In 2017, the Alan Turing Law posthumously pardoned other men convicted under the same grossly unjust laws — approximately 49,000 individuals. In 2021, Turing's face appeared on the British £50 note. None of these actions can undo what was done to a man who had served his country at its most desperate hour.
—— WHY THIS MATTERS ——
Alan Turing's story is one of the most powerful indictments of state persecution of gay people in the twentieth century. The man who made the most consequential single contribution to the Allied victory in the Second World War — by shortening it by an estimated two to four years — was chemically castrated by the state he had helped save, for being gay. The injustice is so extreme that it has become the defining example of the harm done by anti-homosexuality laws.
His work on mathematical biology is as significant as his computing theory, but far less known. The reaction-diffusion theory of biological pattern formation is a major contribution to developmental biology, experimentally confirmed decades after his death. He was working on it when he died. The full extent of what he might have achieved had he lived to seventy or eighty is unimaginable.
The unresolved question of how he died — suicide, accident, or something else — is itself a statement about the circumstances that surrounded him. A man who had been chemically castrated, professionally destroyed, and placed under surveillance died of cyanide poisoning at forty-one. Whether it was deliberate, accidental, or arranged by others, the circumstances reflect the violence that the state had already done to him.
—— THE TAKEAWAY ——
On June 23, 1954, Alan Turing was found dead with a half-eaten apple beside him. He was forty-one. He had broken Enigma. He had invented computing theory. He had been prosecuted for being gay and subjected to chemical castration. His death has never been definitively explained. He was pardoned posthumously. The computer on which you are reading this exists because of his work.
—— QUOTE OF THE DAY ——
"Science is a differential equation. Religion is a boundary condition."
— Alan Turing, undated note
—— OUR QUIZ OF THE DAY ——
How much do you know about the circumstances of Turing's death, the alternative explanations for it, his work on mathematical biology, the posthumous recognition he received, and the Alan Turing Law that pardoned others convicted under the same unjust statutes?
