In the past twenty years Joseph Raz has consolidated his reputation as one of the most acute, inventive, and energetic scholars currently at work in analytic moral and political theory. This new collection of essays forms a representative selection of his most significant contributions to a number of important debates, including the extent of political duty and obligation, and the issue of self-determination. He also examines aspects of the common (and ancient) theme of the relations between law and morality. This volume of essays, available in one volume for the first time, will be essential to legal philosophers and political theorists.