Richard Tuck is Frank G. Thomson Professor of Government at Harvard University. A premier scholar of the history of political thought, his works include Natural Rights Theories; Hobbes; Philosophy and Government, 1572-1651; and most recently, Free Riding. They address a variety of topics including political authority, human rights, natural law, and toleration, and focus on a number of thinkers including Hobbes, Grotius, Selden, and Descartes. His current work deals with political thought and international law, and traces the history of thought about international politics from Grotius, Hobbes, Pufendorf, Locke, and Vattel, to Kant.