Richard Hood Jack Dudley Ryder (born 3 July 1940) is an English writer, psychologist, and animal rights advocate. Ryder became known in the 1970s as a member of the Oxford Group, a group of intellectuals loosely centred on the University of Oxford who began to speak out against animal use, in particular factory farming and animal research.[1] He was working at the time as a clinical psychologist at the Warneford Hospital in Oxford, and had himself been involved in animal research in the United Kingdom and United States.[2]