He has appeared as counsel before the International Court of Justice. He has also represented victims of human rights violations in Africa and Asia, including appearing before Military Tribunals. Karim was elected as the second President of the ICC Bar Association in July 2017 and is a worldwide Ambassador of the African Bar Association. He has published a number of leading texts on international criminal law and is the co-author of Archbold ‘International Criminal Courts’, now in US 5th edition. Karim serves as the Special Adviser and Head of the Investigative Team established pursuant to Security Council resolution 2379 (2017), to promote accountability efforts for genocide, crimes against humanity and war crimes committed by Da’esh/ISIL.