Author: Kevin Jon Heller

Introduction Monica Hakimi’s new article, “Making Sense of Customary International Law,” is my favourite kind of scholarship: bold, critical, revisionist, tendentious. Too few scholars are brave enough to confront the sacred cows of public international law this forthrightly, and for that reason alone Hakimi deserves our thanks and praise. That said, I disagree with nearly every word in Hakimi’s article. An adequate response would require an article of its...

I am honoured and delighted to announce that I have been appointed Professor of International Law and Security at the University of Copenhagen. The position is based in the Centre for Military Studies (CMS), which is part of the Department of Political Science, and will involve working closely with the Ministry of Defence and the various Danish political parties on...

A couple of days ago, Iran issued an arrest warrant for Donald Trump, alleging that he is responsible for murder and terrorism in connection with the drone strike that killed General Qassem Soleimani last January. Practical problems aside -- Interpol has already refused to issue a Red Notice for Trump's arrest -- there is an important legal barrier to prosecuting Trump:...

Along with 174 other American lawyers and legal scholars, I have signed a statement condemning the Trump administration's Executive Order permitting the US to sanction individuals involved with the ICC's investigation into the situation in Afghanistan. It's quite a list of signatories, including three former US war-crimes ambassadors and a number of former judges and prosecutors at various international criminal...

I want to call readers' attention to an upcoming Opinio Juris symposium that is being organized by two fantastic young critical international law scholars, Mohsen al Attar (Warwick) and Rohini Sen (O.P. Jindal). They are looking for a few more contributions, per the Call for Papers -- really a Call for Posts -- below. Note that they would like to...

There is nothing more rewarding for an academic -- at least for this academic -- than seeing a student go on to do great things. I've been fortunate to have many wonderful students over the years, but there is no one I am more proud of than Golriz Ghahraman, whom I taught at the University of Auckland long ago and...

Dhruv Sharma responded today at Justice in Conflict to my recent post arguing that the next ICC Prosecutor should come from the P-3. I wasn't planning on responding, because the post generally caricatures what I wrote. But I have to say something about one of Sharma's arguments that is particularly mistaken and dangerous. Here is what he writes after noting...

My colleagues and I really like the name of our blog. And so, apparently, do others! A new Italian blog has just started that also calls itself Opinio Juris. It appears to cover issues of international law and politics as well, which makes its name more than a little frustrating. You'd think the blog could have chosen a different name,...