Christine M. Korsgaard is Arthur Kingsley Porter Professor of Philosophy at Harvard University. She is the author of Self-Constitution: Agency, Identity, and Integrity (2010), The Constitution of Agency (2009), The Sources of Normativity (Cambridge, 1996) and Creating the Kingdom of Ends (Cambridge, 1996).
Jens Timmermann is Reader in Moral Philosophy at the University of St Andrews. He is the author of Kant's Groundwork of the Metaphysics of Morals: A Commentary (Cambridge, 2007) and Sittengesetz und Freiheit (2003). He is the editor of Kant's Critique of Practical Reason: A Critical Guide (with Andrews Reath, Cambridge, 2010) and of Kant's Groundwork of the Metaphysics of Morals: A Critical Guide (Cambridge, 2009).