Marwan’s experience extends beyond Canada’s borders. He has appeared as a Visiting Professional at the International Criminal Court in The Hague and is admitted to act for both suspects and victims before international tribunals, including the Special Tribunal for Lebanon and the Kosovo Specialist Chambers. He also serves as pro bono counsel before the UN Ombudsperson in delisting matters under the ISIL (Da’esh) and Al-Qaida sanctions regime. He assists the Office of the Ombudsperson and the Security Council at the UN in their mission to counter terrorism. His international work reflects a lifelong commitment to accountability, due process, and justice on a global scale.
Maintained an active international practice spanning international criminal law, human rights advocacy, and humanitarian law, with appointments and engagements before leading international institutions and tribunals.
Regularly appointed as legal representative for petitioners before the Office of the Ombudsperson of the United Nations Security Council Sanctions Committee, advancing delisting requests and humanitarian submissions on behalf of individuals and entities subject to UN sanctions regimes.
Since 2018, admitted to practice before the International Criminal Court, acting as counsel for victims and suspects in international criminal and human rights proceedings — bringing representation to those most affected by atrocity crimes within the institutional framework of the Court's legal aid and participation mechanisms.
From 2018 to 2019, served as a Visiting Professional with the Registry of the International Criminal Court, working within the Court's institutional framework on matters relating to international criminal procedure and human rights law.
In 2020, was appointed as Judicial Legal Officer to the Special Tribunal for Lebanon; the appointment did not commence as the onset of the COVID-19 pandemic prevented the position from proceeding prior to its start date.
From 2015 to 2017, acted as counsel for vulnerable refugees and survivors of war crimes in proceedings before the Ontario Court of Justice and the Superior Court of Justice, advancing humanitarian, human rights, and dignity-based arguments in matters involving immigration detention, psychiatric committal, fitness to stand trial, and proportionality of state response.
Regularly acts as counsel in Canada–United States extradition proceedings engaging cross-border human rights considerations, including submissions on duress, proportionality, and the humanitarian consequences of extradition to face federal prosecution in the United States.