Ilham Dilman (1930-2003) was Professor Emeritus and Honorary Fellow, Department of Philosophy, University of Wales Swansea. He was perhaps most well known for his contributions to moral philosophy and psychology, and in particular on the works of Wittgenstein and Freud. His publications include Wittgenstein's Copernican Revolution (Palgrave, 2002), Free Will: A Historical and Philosophical Introduction (Routledge, 1999), Existential Critiques of Cartesianism (Macmillan, 1993), and Freud and Human Nature (Blackwell, 1983).

Brian Davies is Professor of Philosophy at Fordham University, New York, USA. His publications include An Introduction to the Philosophy of Religion (Oxford University Press, 3rd edition, 2003) and The Thought of Thomas Aquinas (Oxford University Press, 1992).