A. John Simmons is widely regarded as one of the most innovative and creative of today's political philosophers. His work on political obligation is regarded as definitive and he is also internationally respected as an interpreter of John Locke. The characteristic features of clear argumentation and careful scholarship that have been hallmarks of his philosophy are everywhere evident in this collection. The essays focus on the problems of political obligation and state legitimacy as well as on historical theories of property and justice. Cumulatively the collection presents a distinctive social and political philosophy, exploring the nature of our most fundamental rights and obligations, and displaying the power and plausibility of Lockean ideal theory.