Remembering Alan Turing on His 100th

Maria Popova in Brain Pickings:

Little about your day so far, including reading this, would be the same were it not for logician, mathematician, avid reader, and computer science pioneer Alan Turing, who was born 100 years ago tomorrow. While he remains celebrated as instrumental in the invention of the computer, responsible for coining the very concepts of “computation” and “algorithm” in their present form, Turing — who has shaped nearly every facet of our modern lives — is also one of history’s most tragic figures. Beyond his intellectual prowess, another aspect of his character permeated his intellectual contribution and ultimately led to his untimely death, yet it remains at best a silent echo.

In 1952, Turing was criminally prosecuted by the U.K. government for his homosexuality, illegal at the time, and forced to take female hormones to “cure” his unlawful “disorder” — a process known as chemical castration — as an alternative to a prison sentence. Less than two years later, shortly before his forty-second birthday, Turing committed suicide. In The Man Who Knew Too Much: Alan Turing and the Invention of the Computer (public library), David Leavitt offers a poignant lens on how Turing’s homosexuality factored into his intellectual and creative triumphs and tribulations:

In a letter written to his friend Norman Routeledge near the end of his life, Turing linked his arrest with his accomplishments in an extraordinary syllogism:

Turing believes machines think
Turing lies with men
Therefore machines cannot think

His fear seems to have been that his homosexuality would be used not just against him but against his ideas. Nor was his notion of the rather antiquated biblical locution ‘to lie with’ accidental: Turing was fully aware of the degree to which both his homosexuality and his belief in computer intelligence posed a threat to organized religion. After all, his insistence on questioning humankind’s exclusive claim to the faculty of thought had brought on him a barrage of criticism in the 1940s, perhaps because his call to ‘fair play’ to machines encoded a subtle critique of social norms that denied to another population — that of homosexual men and women — the right to a legitimate existence. For Turing — remarkably, given the era in which he came of age — seems to have taken it as a given that there was nothing wrong with being homosexual; more remarkably, this conviction came to inform even some of his most arcane mathematical writings. To some extent his ability to make unexpected connections reflected the startlingly original — and at the same time startlingly literal — nature of his imagination.