Darian Leader is a British psychoanalyst and the author of Introducing Lacan, Why do Women Write More Letters Than They Post?, Promises Lovers Make When It Gets Late, Freud's Footnotes, Stealing the Mona Lisa, Why do People Get Ill, co-written with David Corfield, The New Black, What Is Madness, Strictly Bipolar and Hands. He practises psychoanalysis in London, and he is a member of the College of Psychoanalysts and a founding member of the Centre for Freudian Analysis and Research.David Corfield is a researcher in the Department of Biological Cybernetics at the Max Planck Institute and has been lecturer in the history and philosophy of science at the Universities of Cambridge and Oxford. He is the author of Towards a Philosophy of Real Mathematics and editor of Foundations of Bayesianism.