Organizations are central actors of modern society. No understanding of our world is complete without a theory of how they work. This insight is grounded in the foundational texts of classical social theory, and it remains as true as ever today. Be they multinational corporations or start-up firms, established political parties or insurgent social movements, successful organizations must engage in power-projects. Such is the overarching argument of this volume, a collection of papers by many of the world's leading social scientists and organizational scholars. Many contributions analyze empirical data to generate cutting-edge arguments about the actual working of organizations, institutions, and markets. Other papers represent original theoretical arguments that propose new ways to see and study power. Topics addressed include the nature of post-bureaucratic (polyarchic) organizations, strategic action within fields, identity and contentious politics, and emergent forms of resistance. Collectively, the papers that comprise this volume set a fresh agenda for the study of power in and across organizations and institutions.