Society Frangaise de Droit Аёпеп et Spatial.
University of Munich & Saarbrucken, Germany, 1954-1959, State Exam in Law & Diploma European Studies. University of Paris l, 1959-1960, Dr Public International Law. McGill University, 1960-1961, Master of Laws.
University of California at Berkeley, United States of America, 1961-1962, Rch Fellow in Law. Spoken languages: English, French.
Director, Onchocerciasis Control Program, World Health Organization since 1990. Director, tions: present post since 1991. Senior Environmental Affairs Officer & Chief, Air Pollution Section, Economic Commission for Europe, Geneva, 1986-1991.
Chief, Environmental Law Unit, & Deputy Director, Environmental Management Service, United Nations Environment Programme, Kenya, 1983-1986. Assistant Director-General, International Union for Conservation of Nature & Natural Resources, Switzerland, 1981-1983. Secretary-General, Convention on International Trade in Endangered Species of Wild Fauna & Flora, Switzerland, 1978-1981.
Senior Legal Officer/ Environmental Law Officer, Food and Agriculture Organization, Rome, 1970-1978. Associate Proofessor of Law, Institute of Air & Space Law, McGill University, Canada, 1968-1970 & 1963-1965. Visiting Professor of Law, Haile Sellassie University, Ethiopia, 1965-1968.