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Felix Herbert

Research Fellow

Main Fields of Research:

Prohibition of the Use of Force, Peremptory Norms of International Law (ius cogens)

Academic Career:

Since 01/2021 Research Fellow at the MPIL

2020 First State Exam in Law, with a special focus on Public International Law

2018-2020 Student Assistant at the MPIL, Max-Planck-Research Group Shades of Illegality in International Peace and Security Law

2014-2020 Law Studies, University of Heidelberg

  • 2016: ERASMUS-Semester, Université de Montpellier, France
  • Jessup Moot Court 2018 (participant) and 2019 (coach)


  • Jurisdictional Immunities, all over again? ICJ proceedings instituted by Iran against Canada (27 June 2023): Some Observations on Jurisdiction and Merits. EJIL:Talk!, 07 July 2023 (with Valentin von Stosch). EJIL:Talk!
  • Disobeying the Security Council or a disobedient Security Council? The effects of jus cogens on Security Council resolutions in recent debates of the ILC and in the views of states. EJIL:Talk!, 12 August 2022. EJIL:Talk!
  • Die Lesbarkeit von Gesetzentwürfen - über unverständliche Änderungsbefehle, zweckmäßige Synopsen und verfassungsrechtliche Anforderungen. Verfassungsblog, 04 March 2021. Verfassungsblog

Further Publications

  • Wie sollte die Bundesrepublik Deutschland die UN-Leitprinzipien für Wirtschaft und Menschenrechte umsetzen? In: StudZR WissOn 1, 118-155 (2019). StudZR WissOn


14 Sep 2023

Identifying the peremptory norm in the ius contra bellum and clarifying the relationship between the prohibition and exceptions

Faculty of Law, Palacký University Olomouc

27 Apr 2023

(Ir-)Relevance of ius cogens? Legal consequences of ius cogens in Russia’s war of aggression against Ukraine

ESIL Research Forum in Tartu, Estonia

25 Jul 2022

Peremptory norms of general international law (jus cogens) – Draft Conclusions and Annex adopted by the ILC's Drafting Committee on second reading

MPIL Monday Meeting, Heidelberg

Participation in Conferences at Home and Abroad

International Law and the Regulation of Resort to Force: Exhaustion, Destruction, Rebirth?, Faculty of Law, Palacký University Olomouc, 14.09.2023 - 15.09.2023

2023 ESIL Research Forum (“Regional Developments of International Law in Eastern Europe and Post-Soviet Eurasia“), Tartu, Estonia, 27.04.2023 - 28.04.2023

Contested Norms of International Peace and Security Law, MPIL Heidelberg, 23.09.2021 - 24.09.2021

International Law as Process and Practice: A Transatlantic Conversation on Use of Force, Berlin, 03.07.2019

Max Planck Trialogues on the Law of War and Peace, Vol. IV - Intervention by Invitation, MPIL Heidelberg, 08.11.2018 - 09.11.2018


Philip C. Jessup International Law Moot Court Competition

Judge for Memorials (2022, 2023) and Oral Rounds (International Rounds 2022, Italian National Rounds 2023)