Book excerpt: The Impact of International Organizations on International Law addresses how international organizations, particularly those within the UN system, have changed the forms, contents, and effects of international law. Professor Jose Alvarez considers the impact on sovereigns and actions taken by the contemporary Security Council, the UN General Assembly, and UN Specialized Agencies such as the World Health Organization. He considers the diverse functions performed by adjudicators – from judges of the International Criminal Court to arbitrators within the international investment regime. This text raises fundamental questions concerning the future of international law given the challenges international organizations pose to legal positivism, to traditional conceptions of sovereignty, and to the rule of law itself. "A masterfully crafted piece of scholarship that engages with the very raison d’être of international organizations. Written by one of the leading authorities in the field, this book provides an insightful, perspicacious and to-the-point analysis of the impact of international organizations in today’s international legal order while also shedding light on their weaknesses. A must read for all those whose work touches upon the law of international organization." ~Laurence Boisson de Chazournes, University of Geneva "The role of Public International Law, rooted largely in decisions of or relating to international institutions, has been steadily, quietly re-shaping international economic relations and other links between states and regions for decades. There is no greater authority on international organizations within the American law community than Professor José Alvarez. This volume illuminates these trends as well as their limitations and vulnerabilities. It delivers a first-rate, incisive primer on the field." ~David M. Malone, Under-Secretary-General of the United Nations, Rector of the UN University