W. F. Bynum is Professor Emeritus of the history of medicine at the Wellcome Centre for the History of Medicine at University College London. His research has been directed at a number of topics, including the history of psychiatry, the relationship between basic science and medical practice, the history of disease, especially malaria in British India, and the impact of evolutionary biology on medicine. He has edited many books, including (with Janet Browne and Roy Porter) The Macmillan Dictionary of the History of Science (1981), and (with Roy Porter) Companion Encyclopedia of the History of Medicine, 2 vols. (1993). He is the author of Science and the Practice of Medicine in the Nineteenth Century (1994). He is a Fellow of the Royal College of Physicians of London and of Edinburgh. Roy Porter was until his retirement Professor of the Social History of Medicine at the Wellcome Centre for the History of Medicine at University College London. His books include English Society in the Eighteenth Century (1982), Mind Forg'd Manacles (1987), A Social History of Madness (1987), London: A Social History (1994), The Greatest Benefit to Mankind (1997), Enlightenment (2000), Madness: A Brief History (2002), and Flesh and the Age of Reason (2003). He died in March 2002.