John Archer is Professor of Psychology at the University of Central Lancashire. His research interests are aggression, violence, sex and gender, and grief. He is the author of a number of books, including The Nature of Grief (1999), Ethology and Human Development (1992) and The Behavioural Biology of Aggression (1988). He is a Fellow of the British Psychological Society and President-Elect of the International Society for Research on Aggression.