Last Update: 1 November 2004
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Alan Turing: Thinking Up Computers
By Andy Reinhardt in Paris
The Cambridge University mathematician laid the foundation for the invention of software
As part of its anniversary celebration, BusinessWeek is presenting a series of weekly profiles for the greatest innovators of the past 75 years. Some made their mark in science or technology; others in management, finance, marketing, or government. In late September, 2004, BusinessWeek will publish a special commemorative issue on Innovation.
The rarefied world of early 20th-century mathematics seems light years away from today's PCs and virtual-reality video games. Yet it was a 1936 paper by Cambridge University mathematician Alan M. Turing that laid the foundation for the electronic wonders now crowding into every corner of modern life. In a short and eventful life, Turing also played a vital role in World War II by helping crack Germany's secret codes -- only to be persecuted later for his homosexuality.
A shy, awkward man born into the British upper middle class in 1912,
Turing played a seminal role in the creation of computers. To be sure,
many other people contributed, from mathematicians Charles Babbage and
Ada Lovelace in the 1830s to Herman Hollerith -- whose tabulating
company became IBM (IBM
As basic as Turing's notion seems today, it was radical in the
mid-1930s. But before the first programmable computers were built,
Turing got diverted into the war effort. He worked for five years at
Bletchley Park, north of London, with dozens of Britain's brightest
minds. Through endless hours and logical deduction, they unraveled the
Enigma code used by the Germans to send messages to field commanders and
U-boats.
Turing was himself an enigma. He adored maps and chess as a child and
survived the brutal boarding school system by withdrawing into
eccentricity. Later he found solace in distance running. Turing realized
young that he was attracted to other men, but homosexuality was
outlawed. So he lived a secret life, torn by inner battles between the
mind and body. As long as he was useful to the government, officials
overlooked his sexuality, says his biographer, Oxford mathematics
research fellow Andrew Hodges. After the war, Turing became more overt
in his relationships and was convicted in 1952 of "gross indecency." He
was subjected to injections of female hormones, ostensibly to quell
sexual desires, and shunned as a security risk. In 1954, at 41, he died
suddenly, almost certainly by suicide from eating a cyanide-laced apple.
Turing didn't live to see the revolution he unleashed. But he left an
enormous legacy. In 1950 he proposed a bold measure for machine
intelligence: If a person could hold a typed conversation with
"somebody" else, not realizing that a computer was on the other end of
the wire, then the machine could be deemed intelligent. Since 1990 an
annual contest has sought a computer that can pass this "Turing Test."
Nobody has yet taken the $100,000 purse. Turing would no doubt be
delighted that engineers the world over are still trying.
Copyright © 2004 by
William J. Rapaport
(rapaport@cse.buffalo.edu)
file: 111F04/turing-businessweek-2004-11-01.html