Ernest Lenaerts (1910 to 1997) was a British electrical engineer who joined the catering firm J. Lyons and Co. in 1926 and, after wartime service as an RAF wireless mechanic, was sent by Lyons to work with Maurice Wilkes at Cambridge University's Mathematical Laboratory on the EDSAC computer. He brought the expertise gained there back to Lyons, where between 1949 and 1953 he worked with John Pinkerton to build LEO, the first computer used for business data processing. The notebooks he kept during that work are regarded as the only surviving contemporary written account of LEO's installation and development.
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