Prof. SienhoYee is Chief Expert at Wuhan University Intstitute of International law. He is also member of Institut de Droit International. Prof. Yee’s research interests are in public international law, especially the jurisprudence of the International Court of Justice and the structural questions of the international legal system. His articles have appeared in fine journals such as American Journal of International Law, Columbia Law Review, and European Journal of International Law. His papers were cited by State parties before the ICJ and his arguments were discussed in open court during proceedings at the ICJ. In a paper published in April 2001 he proposed the concept of the ‘international law of co-progressiveness’ and coined this phrase to capture the spirit of the current stage of international law development following the law of co-existence and the law of co-operation.