Computing came naturally to Berners-Lee, as both of his parents worked on the Ferranti Mark I, the first commercial computer. (See computer: The first stored-program machines.) After graduating in 1976 from the University of Oxford, Berners-Lee designed computer software for two years at Plessey Telecommunications Ltd., located in Poole, Dorset, England. Following this, he had several positions in the computer industry, including a stint from June to December 1980 as a software engineering consultant at CERN, the European particle physics laboratory in Geneva.