Jens Timmermann is the Professor of Moral Philosophy at the University of St Andrews. He is a leading authority in Immanuel Kant's ethics and is the author of several books on Kant, including Kant's Groundwork of the Metaphysics of Morals: A Commentary (2007) and Sittengesetz und Freiheit (2003). He is also the editor of the first German-English edition of Kant's Groundwork (2011).