th Rüdiger Wolfrum celebrated his 65 birthday on 13 December 2006. On this special occasion, current and former members of the large circle of his PhD and post-doctorate students (Doktoranden und Habilit- den) organized a symposium on the subject of International Law - day: New Challenges and the Need for Reform? to honour him and his academic work as a teacher and researcher. The symposium took place at the Max Planck Institute for Comparative Public Law and - ternational Law in Heidelberg on 15 and 16 December 2006. Since Rüdiger Wolfrum is a renowned scholar in many different fields of public national and international law, the subjects covered by the speakers and commentators reflect the wide variety of issues he worked on in his long and impressive academic career. They extend from a cri- cal evaluation of the new responsibility to protect and the role of the UN Security Council in post-conflict management, thoughts on the proliferation of international tribunals with regard to the unity or fragmentation of international law, marine genetic resources in the deep sea and environmental protection in Antarctica to human rights issues relating to intellectual property rights and the protection of minorities. All the presentations focused on new trends in international law and thus followed the lead of Rüdiger Wolfrum who has always been at the forefront of innovative legal developments.

Responsibility, Sovereignty and Cooperation Reflections on the Responsibility to Protect.- Sovereignty and the Responsibility to Protect in International Criminal Law.- Managing Risks to Global Stability: the UN Security Councils New-found Role Post Iraq.- Comment on the Contribution by Volker Röben.- Promoting the Unity of International Law: Standard-Setting by International Tribunals.- Where Unity Is at Risk: When International Tribunals Proliferate.- Genetic Resources of the Deep Sea How Can They Be Preserved?.- The Liability Annex to the Protocol on Environmental Protection to the Antarctic Treaty.- The Strange Case of Human Rights and Intellectual Property: Is There a Way to Reconcile Dr. Jekyll with Mr. Hyde?.- The Struggle for Minority Rights and Human Rights: Current Trends and Challenges.- Minority Rights as Group-Protective Rights: A Challenge for the International Law of Human Rights.