Norman Feather FRS FRSE PRSE (16 November 1904, Pecket Well, Yorkshire – 14 August 1978, Christie Hospital, Manchester), was an English nuclear physicist. Feather and Egon Bretscher were working at the Cavendish Laboratory, Cambridge in 1940, when they proposed that the 239 isotope of element 94 (plutonium) would be better able to sustain a nuclear chain reaction.