This book is an account of the life and times of a loose friendship group (later christened the Oxford Group) of ten people, primarily postgraduate philosophy students, who attended the University of Oxford for a short period of time from the late 1960s. The Oxford Group, which included—most notably—Peter Singer and Richard Ryder, set about thinking about, talking about, and promoting the idea of animal rights and vegetarianism. The group therefore played a role, largely undocumented and unacknowledged, in the emergence of the animal rights movement and the discipline of animal ethics. Most notably, the group produced an edited collection of articles published as Animals, Men and Morals in 1971 that was instrumental in one of their number—Peter Singer—writing Animal Liberation in 1975, a book that has had an extraordinary influence in the intervening years. The book serves as a case study of how the emergence of important work and the development of new ideas can be explained, and, in particular, how far the intellectual development of individuals is influenced by their participation in a creative community.