Ingo is Professor for International Law and Social Justice at the University of Amsterdam.
He works on general public international law, with a focus on international economic and climate law. His recent research includes the relationship between international law and nationalism and the role of law in the climate crisis. He is finishing a short book on “Fossil Sovereignty: The Struggle for Law of the Climate Crisis” (together with Jochen von Bernstorff).
His publications include Contingency in International Law: On the Possibility of Different Legal Histories (OUP 2021, with Kevin Jon Heller) and How Interpretation Makes International Law: On Semantic Change and Normative Twists (OUP 2012; Winner of the 2014 Book Prize of the European Society of International Law). He occasionally writes for public media, such as European Review of Books (Tragedy & Farce in Climate Commentary, 2023) and Arts of the Working Class.
Since 2025, Ingo acts as Research Director of the Faculty of Law of the University of Amsterdam and forms part of the faculty board. Before that, he directed the Amsterdam Center for International Law (ACIL) (2016-2025) and led the collaborative research project on Sustainable Global Economic Law (SGEL).
Ingo was Editor-in-Chief of the Leiden Journal of International Law (2015-2014), Visiting Professor at the School of Advanced Studies Sant'Anna, Pisa (2025), Braudel Senior Fellow at the European University Institute (2024) and a Fellow at The New Institute (2021/22). He held visiting positions at UC Berkley, Jindal Global Law School, UC Berkeley, the National University of Singapore, Tel Aviv University, and he was a Hauser Scholar at New York University. Since 2018 he is a member of the Advisory Board of the WZB Berlin Social Science Center. He obtained his PhD from the Goethe University in Frankfurt while working as a researcher at the Max Planck Institute in Heidelberg.
His Inaugural Lecture on International Law and the Spectre of Inequality is available in print [here] and as a video, [here] (May 2019). In 2025, Ingo gave the Spring Lecture of the Royal Netherlands Society of International Law (KNVIR), titled: International Law and Nationalism: Histories of a Complicated Relationship.