One of the most influential Oxford philosophers of the twentieth century, Prichard was White’s Professor of Moral Philosophy there from 1928 to 1937. His work combines epistemological realism and moral intuitionism. From 1906 onwards Prichard was active with the Oxford realists, who held, against idealists, that reality exists independently of mind, that knowledge is of reality, and that common-sense realism is correct. In ethics, he was the leader of the Oxford intuitionists who held, against utilitarianism, that common-sense morality is correct, its duties are known non-inferentially, and are an irreducible plurality of distinct kinds of act. His philosophical style displays concentration on specific problems, carefully using ordinary language to make precise distinctions in the absence of general theory. He influenced Oxford’s next generation of Austin, Ryle, Hart and Berlin, who attended his classes and, occasionally, his ‘philosophers’ teas’.