The Atlas Computer Laboratory on the Harwell, Oxfordshire campus shared by the Harwell Laboratory was one of the major computer laboratories in the world, which operated between 1961 and 1975 to provide a service to British scientists at a time when powerful computers were not usually available. The main user population was the UK Universities and some government agencies. Throughout its life it was headed by Jack Howlett. Early staff or visitors included A. O. L. Atkin (1964–1970), I. J. Good (1964–1967), and Donald Michie who had worked together at Bletchley Park during the Second World War.