sentences:  A nephew of the French Impressionist painter Camille Pissarro, and the son of Jewish socialist Dr Ruth Bensusan-Butt (1877–1957), the first woman doctor to work in Essex, Bensusan-Butt was educated at Gresham's School, Holt, and King's College, Cambridge, where he was a student of John Maynard Keynes and indexed Keynes's magnum opus, the "General Theory of Employment, Interest and Money".Bensusan-Butt acted as an assistant to Keynes, for searching literature and writing references, making him Keynes's best-informed student on progress with the project, so that one historian of economics has described him as 'the favoured man'.After a short period working for "The Economist", Bensusan-Butt joined the civil service in 1938.