This liber amicorum has been written by prominent colleagues and friends of Professor of Public International Law and former President of the International Court of Justice, Jose Maria Ruda (1924-1994). The collection celebrates a lifelong career devoted to the promotion of public international law and dedicated to the furtherance of international organizations including the United Nations General Assembly, the Security Council, the International Law Commission, and the International Labour Organization. In addition Professor Ruda has played a prominent role in a number of international tribunals while also occupying important government and public positions, particularly in South America. The content of the collection reflects these broad activities of Professor Ruda, both in his academic and practical achievements. Contributions in English, Spanish and French cover the fields of international law, humanitarian law and human rights; international disputes, territorial sovereignty and maritime law; and the law of economic integration.