John Pinkerton (computer designer)

John Maurice McClean Pinkerton (2 August 1919 – 22 December 1997) was a pioneering British computer designer. Along with David Caminer, he designed England's first business computer, the LEO computer, produced by J. Lyons and Co in 1951.,

John Pinkerton was educated at King Edward's School, Bath, and Clifton College, Bristol. He studied at Trinity College, Cambridge from 1937 to 1940, reading Natural Sciences, and graduating with first class honours. He joined the Air Ministry Research Establishment in Swanage, to work on radar, and went with it to Malvern where it was renamed the Telecommunications Research Establishment (where he met Maurice Wilkes). He returned to Cambridge as a research student at the Cavendish Laboratory.

In 1948 he married Helen McCorkindale. They had a son and a daughter.

Colleagues describe him as having "a disarming way of listening intently to what others said", a "quiet, dry sense of humour", a "fine, critical, but constructive intelligence", "an enviable ability to handle detail", and "friendliness and kindness". They also mention his knowledge of music and English literature and his lively appreciation of good food.

The catering firm of J. Lyons was known in the high street for its tea and cakes; in the business world it was known for its innovative approach to supply chain management. As early as 1947 the firm decided that the future lay with computers, and since nothing suitable was available, they resolved to build one. They approached Wilkes in Cambridge, who suggested that they construct a copy of the EDSAC machine, and introduced them to Pinkerton whom they recruited as chief engineer.

Pinkerton's approach was to leave the design unchanged as far as possible, while improving reliability by identifying the points of failure (notably electronic valves) and developing test procedures that enabled component failures to be anticipated and prevented.

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