John Locke's theory of personal identity underlies all modern discussion of the nature of persons and selves--yet it is widely thought to be wrong. In his new book, Galen Strawson argues that in fact it is Locke's critics who are wrong, and that the famous objections to his theory are invalid. Indeed, far from refuting Locke, they illustrate his fundamental point. Strawson argues that the root error is to take Locke's use of the word "person" only in the ordinary way, as merely a term for a standard persisting thing, like "human being." In actuality, Locke uses "person" primarily as a forensic.