Mark C. Murphy has been at Georgetown since 1995. His research interests include moral, political, and legal philosophy and the history of early modern philosophy. His research focuses on natural law theory both in its historical manifestations and as a live option for jurisprudence and the theory of practical reasoning. He is the author of Natural Law and Practical Rationality (Cambridge, 2001), An Essay on Divine Authority (Cornell, 2002), Natural Law in Jurisprudence and Politics (Cambridge, 2006), Philosophy of Law (Blackwell, 2006), and God and Moral Law: On the Theistic Explanation of Morality (Oxford, 2011), and is editor of Alasdair MacIntyre (Cambridge, 2003). He has also written a number of papers on Hobbes’s moral, political, and legal theory.