The most exciting development in legal thinking since World War II has been the growth of interdisciplinary legal studies. Judge Richard Posner has been a leader in this movement, and his new book explores its rapidly expanding frontier.

Nicholas Onuf’s International Legal Theory: Essays and Engagements 1966-2007 is a collection of the author’s articles and book reviews from the period, including some previously unpublished material. The book records the author’s efforts to address important problems in international legal theory and to engage other scholars who were also addressing these problems. As well as demonstrating Onuf’s own constructivist contribution to the theoretical dimension of international law and international relations, each piece is preceded by a short introduction which highlights the wider themes and developments which have occurred in the field of international law in the last forty years.

Over the past decades international affairs have been increasingly legalized. International law has dramatically expanded into new fields and taken on new challenges. Despite this development, there has been little in-depth scholarship on what impact these changes have had on the field of international legal theory, how it is taught, and where it is going. This volume investigates the major developments in the field and explores the core assumptions and concepts, analytical tools, and key challenges associated with different approaches. An outstanding team of legal academics provides an accessible overview of competing theoretical movements, and a more in-depth understanding of the strengths, preoccupations, insights, and limits of those schools of thought. The contributions provide an authoritative account of current thinking about the theoretical foundations of contemporary international law and will serve as an indispensable resource for students, scholars, and practitioners.

This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact.

This book focuses on current frontier-related issues such as humanitarian crises, economic crises, discrimination of migrants in certain countries, different typologies of borders such as land, maritime, air, space, and even cyberspace borders, and environmental protection of water resources at borders. It addresses legal and theoretical considerations and presents empirical cases showing the manifestations of the concept in the real world and its dynamics. Without claiming to exhaust the debate on frontiers, especially given the breadth of the subject and the large number of viewpoints from which the phenomenon can be examined, this book intends to be a helpful source of insights for academics, university students, and others who wish to explore the complex and multifaceted worlds that emerge, particularly in a globalized society, from the interaction between the various actors and scenarios that shape the reality of frontiers.