Mark Timmons is Professor of Philosophy at the University of Arizona. He is author of Morality without Foundations (OUP, 1999), editor of Kant's Metaphysics of Morals: Interpretative Essays (OUP, 2002), co-editor of Metaethics After Moore (OUP, 2006), and editor of Oxford Studies in Normative Ethics (published annually).Sorin Baiasu is Reader in Philosophy at Keele University, UK. He is the author of Kant and Sartre: Re-discovering Critical Ethics (2011), co-editor of Politics and Metaphysics in Kant (2011), as well as of a special issue of the journal Kantian Review (2011).