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Judge Fergal M. Gaynor serves as the Reserve International Co-Prosecutor at the Extraordinary Chambers in the Courts of Cambodia (ECCC) and previously represented victims at the International Criminal Court. He also served as a Senior Assistant Prosecutor at the ECCC from 2015 to 2016 and as counsel for the prosecution at the International Criminal Tribunal for Rwanda and the International Criminal Tribunal for the former Yugoslavia between 2001 and 2013. Judge Gaynor holds a Bachelor of Laws from Trinity College Dublin (Ireland) and a Master of Philosophy from Cambridge University (UK). He is a member of the Bar of Ireland.

Judge Nina H.B. Jørgensen has been Professor of Public International Law at the University of Southampton since 2019 and served as Deputy Head of the Law School (research) from 2019 to 2021. She was previously Professor of Law (2014-2018) and Associate Professor of Law (2010-2014) at the Chinese University of Hong Kong. From 2001 to 2010, she worked in various capacities at the Special Court for Sierra Leone, including as Senior Appeals Counsel and Senior Legal Adviser for the Office of the Prosecutor, as well as at the Extraordinary Chambers in the Courts of Cambodia, and the International Criminal Tribunals for the former Yugoslavia and Rwanda. She has also worked for the OSCE Office for Democratic Institutions and Human Rights in Warsaw as the Legal Adviser for Tolerance and Non-Discrimination. She has further advised the United Nations and non-governmental organisations on matters relating to international criminal justice. Judge Jørgensen has a D.Phil. (doctorate) from the University of Oxford and a law degree from the University of Bristol (UK). She was called to the Bar of England and Wales (Gray’s Inn) in 1999 and has a practising certificate as a barrister. She has published widely in the field of international criminal law and procedure.  

Judge Marjorie Masselot (France) has been serving as a Presiding Judge at the Colmar First Instance Criminal Court since 2019, where she is dealing with organised crime and sexual crimes. Since 2023, Judge Masselot has been serving as a seconded Judge in the Ministry of Justice of France as a Deputy Head of the Office for Institutional and Diplomatic Affairs at the Delegation for European and International Affairs. From 2017 to 2019, Judge Masselot served as a prosecutor at the Criminal Court of Verdun. Prior to that, Judge Masselot served in various legal officer positions at the War Crimes Chamber of the State Court of Bosnia and Herzegovina from 2006 to 2008, at the United Nations Criminal Tribunal for Rwanda from 2008 to 2009 and at the International Criminal Court from 2009 to 2015. Judge Masselot holds three post-graduated Master degrees in Law from the Law University of Aix-en-Provence and the University of Strasbourg. She has further published and lectured in the field of international criminal law.

Pre-Trial Judge in the cases against Salih Mustafa, Gucati&Haradinaj, Thaci et al, Pjeter Shala, Januzi et al. and Thaci et al (administration of justice). 

After graduation from the Nicolaus Copernicus University in Toruń in 1978, Judge Hofmański started his academic career as an assistant in the Chair of the Criminal Procedure Law at this University.  After completing PhD studies in Toruń (1981), he started as adjunct at the Chair of Criminal Procedure Law at the University of Silesia in Katowice. Judge Hofmański completed his second degree (habilitation) in 1989 and was appointed Professor at the Chair of Criminal Law of the University of Białystok. From 2000 to 2015, he was a Professor at the Jagiellonian University in Krakow, where he ran the Chair of Criminal Procedure Law. He started his judicial career in 1994 as a judge of the Appellate Court in Białystok and was thereafter appointed a Judge of the Criminal Chamber of the Polish Supreme Court in 1996. Judge Hofmański was involved in a number of projects carried out by the Council of Europe.

Judge Hofmański was a Judge at the International Criminal Court from March 2015 until March 2024, where he served as Presiding Judge of the Appeals Chamber and as President of the International Criminal Court from 2021 to 2024. Judge Hofmański is currently a Director of the newly created Center of International Criminal Justice at the Jagiellonian University in Kraków.

Judge Hofmański is an author of more than 300 books, commentaries, articles on constitutional law, criminal law, criminal procedure, international cooperation in criminal matters and human rights protection.