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[Paul Schiff Berman is Dean and Robert Kramer Research Professor at George Washington University Law School.] I want to thank all the participants in this online symposium both for their extraordinarily thoughtful comments on my book and for their many constructive interventions through the years as I have been developing these ideas. I am blessed to be part of a truly supportive academic community, and these posts exemplify all that can be good about thoughtful academic discourse built on dialogue rather than one-upsmanship. Such fruitful academic discourse should not be...

This week we are working with EJIL:Talk! to bring you a symposium on Karen Alter‘s (Northwestern) book The New Terrain of International Law: Courts, Politics, Rights (Princeton University Press). Here is the abstract: In 1989, when the Cold War ended, there were six permanent international courts. Today there are more than two dozen that have collectively issued over thirty-seven thousand binding legal rulings. The New Terrain of International Law charts the developments and trends in the creation and role of international courts, and explains how the delegation of authority to...

[Ruti Teitel, Ernst C. Stiefel Professor of Comparative Law, New York Law School, Visiting Professor, London School of Economics, and Affiliated Visiting Professor, Hebrew University of Jerusalem.] This post is part of our symposium on the latest issue of the Leiden Journal of International Law. Other posts in this series can be found in the related posts below. Armin Bogdandy and Ingo Venzke argue that we should see the increasing activity of international courts and tribunals as the exercise of public authority, requiring justification according to the principles characteristic of...

This week, we are hosting another book symposium on Opinio Juris. This time, we feature a discussion of the new book by Jonathan Hafetz, Punishing Atrocities through a Fair Trial: International Criminal Law from Nuremberg to the Age of Global Terrorism, published by Cambridge University Press. In addition to comments from Jonathan himself, we have the honor to hear from a list of renowned scholars and practitioners: Mark Kersten, Gabor Rona, Sasha Greenawalt and Meg de Guzman. From the publisher: Over the past decades, international criminal law has evolved to become the operative...

[Claire Kelly is a Professor of Law at Brooklyn Law School.] This post is part of the Virginia Journal of International Law Symposium, Volume 52, Issues 1 and 2. Other posts in this series can be found in the related posts below. Thank you very much to Opinio Juris for this opportunity to comment on this set of Articles recently published in the Virginia Journal of International Law. To address rationalism’s failings, Professor Cho prescribes a constructivist or sociological lens in his Article, “Beyond Rationality: A Sociological Construction of the...

be established under appropriate legal rules and regulations in national law (whether military or civilian), it must have relevant procedural guarantees and an established composition and rules of procedure (paras 1125, 1127, 1128). States must have the laws or regulations in place to be able to establish such a tribunal quickly and effectively, and this can only be done adequately by preparation in peacetime (para 1126). Article 17 of GCIII provides that “Each party to a conflict is required to furnish the persons under its jurisdiction who are liable to...

[ Jessica Dorsey is an Assistant Professor of International Law at Utrecht University School of Law, a member of the core teaching team of the Utrecht University Open-Source Global Justice Investigations Lab and Managing Editor of Opinio Juris] This week, Opinio Juris has the pleasure of hosting an exciting discussion on open-source investigations labs, educational approaches and societal impact. The collection of posts running from today through Friday come from reflections from a conference hosted by Utrecht University’s Open-Source Global Justice Investigations Lab in June 2025. For background on the...

Robert Howse is the Lloyd C. Nelson Professor of International Law at New York University School of Law. Joanna Langille is a 2011 graduate of New York University Law School.] This post is part of the Yale Journal of International Law Volume 37, Issue 2 symposium. Other posts in this series can be found in the related posts below. Our article examines the extent to which countries can use animal welfare concerns to justify placing restrictions on international trade, under the law of the World Trade Organization (WTO). We argue...

[Jonathan Hafetz is a Senior Staff Attorney in the Center for Democracy at the American Civil Liberties Union and Professor of Law at Seton Hall Law School . This post is part of our Punishing Atrocities Symposium.] The central purpose of Punishing Atrocities through a Fair Trial is to unpack and examine the enduring tension in international criminal law between principles of fairness, on one hand, and accountability for atrocities on the other. Any system of criminal justice that seeks to hold perpetrators responsible for their violent and destructive actions...

[Karin Mickelson is an Associate Professor in Law at the University of British Columbia] This post is part of the Leiden Journal of International Law Vol 25-2 symposium. Other posts in this series can be found in the related posts below. It seems a bit dull to kick off an online commentary with a resounding “I agree”, but that is precisely how I am tempted to respond to Mario Prost and Alejandra Torres Camprubi’s “Against Fairness? International Environmental Law, Disciplinary Bias and Pareto Justice.” When invited to comment, I assumed...

I commend Katerina Linos’ book to our readers and echo the many positive comments that others in this book symposium have shared. Her theory of bottom-up democratic diffusion of norms addresses many of the concerns that have been voiced regarding the democracy deficit that occurs when policy elites borrow from abroad. I want to push Katerina a bit on the question of actors involved in the diffusion process. She notes that “many academics, judges and commentators emphasize how references to foreign law reflect elite predilections antithetical to the views of...