Derek Hemy (1920 to 2000) joined the catering firm J. Lyons and Co. as a management trainee in 1939 and, after wartime service, returned in 1946 to its Systems Analysis Office under David Caminer. Selected as the first programmer for LEO, the computer Lyons built for its own business processing, he received training from Maurice Wilkes at Cambridge University's Mathematical Laboratory and went on to write LEO's programs, developing standards for breaking programs into documented stages that let other programmers follow the logic. He left LEO in 1955 to take a senior role in EMI's computing venture.
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