Jacques Lacan is the greatest psychoanalyst since Freud, and one of the most important thinkers of the twentieth century. His ideas, ranging from the influential concept of the 'mirror stage' to the development of the 'three orders' of the imaginary, the symbolic and the real, were instrumental in transforming our understanding of both the relationship between the individual and society, and the relationship between psychoanalysis and poststructuralist philosophy. His influence is profound, not only on clinical psychology, literature and critical theory, but also on contemporary gender studies and on radical thinkers such as Alain Badiou and Slavoj Žižek. Polity is now in the process of publishing in English the enormously influential volumes of his Seminar, edited by Jacques-Alain Miller. Transference, Anxiety and The Sinthome have already been published and numerous volumes are forthcoming. Polity has also published other works by Lacan, including The Triumph of Religion and On the Names-of-the-Father.