John Harris is Emeritus Professor of Psychology at the University of Reading, where he has taught about perception for over twenty years. Previously, he worked at the National Physical Laboratory, and later at the University of Bristol, in the Departments of Anatomy and  Psychology. He has published more than 70 articles and book chapters on aspects of visual perception and its abnormalities. He has been associated for many years with the international journal Perception, first as an Associate Editor and later as a member of the Editorial Board.