Robert Spaemann is Emeritus Professor at the University of Munich and Honorary Professor of the University of Salzburg. His research focuses on Christian ethics with particular attention to bioethics, ecology, and human rights. Oliver O'Donovan is Professor Emeritus of Christian Ethics and Practical Theology at the University of Edinburgh. He is the Series Editor of the Oxford Studies in Theological Ethics series and a past President of the Society for the Study of Christian Ethics. His publications include The Desire of the Nations (Cambridge University Press, 1996), Common Objects of Love (Eerdmans, 2002), and The Ways of Judgment (2005).