This book brings together thirteen essays from the celebrated international theorist Nicholas Greenwood Onuf. They address topics that Onuf has puzzled over for decades, prompting him to develop a distinctive perspective on international theory as social theory. Among these topics are the problem of materiality in social construction, epochal change in the modern world and the power of language. Building on the work of giants, from Aristotle and Cicero, Hume and Kant, to Derrida and Foucault, and drawing on diverse contemporary theorists, including Seyla Benhabib, James Der Derian, Johan Galtung, Morton Kaplan, Joseph Nye, James Rosenau, Elaine Scarry and Kenneth Waltz, the book ranges over the margins of the fi eld and settles on issues that have never been put to rest.