Dr. Mojtaba Kazazi is a former judge of the courts of Tehran and has a long experience in international arbitration. Currently he is serving as a Vice-président of the Institut de Droit International and acting as arbitrator in different disputes. He is also a board member of Tehran Regional Arbitration Centre. Dr. Kazazi worked extensively on the arbitration and settlement of claims before the Iran-Unites States Claims Tribunal at The Hague. He also served for many years as the Executive Head of the United Nations Compensation Commission (UNCC), and as the Secretary of its Governing Council, in Geneva, where he was instrumental in setting up the UNCC and in resolving 2.7 million claims from over 100 countries. More recently, Dr. Kazazi was the Executive Commissioner of two international mass claims programs for payment of compensation to workers. Dr. Mojtaba Kazazi is a graduate of Tehran University (LLB and LLM) and UCL Louvain (PhD) and has a wide teaching experience. He lectured at The Hague Academy of International Law in 2017 and is currently a visiting scholar at the Graduate Institute, in Geneva. His publications include the book “Burden of Proof and Related Issues: A Study on Evidence before International Tribunals” (Kluwer 1996).