 He took his doctorate in philosophy from the University of Oxford, and has held various academic positions in philosophy in Britain, Ireland and the United States.His best known work is his international best-selling memoir, "The Philosopher and the Wolf", about the decade he spent living and travelling with a wolf.As Jonathan Derbyshire wrote in his "Guardian" review, "it is perhaps best described as the autobiography of an idea, or rather a set of related ideas, about the relationship between human and non-human animals."