Researcher, University Mohamed V, Rabat, Morocco, 1966-1968. Assistant professor University Bordeaux, 1968-1969, professor mathematics, since 1969, research director, since 1970. Professor University Yaounde, Cameroon, 1977-1978.
Senior adviser in science and technical United Nations Educational, Paris, since 1976, United Nations, New York City, since 1979, Organization African Unity, Addis-Ababa, Ethiopia, since 1979. Secretary-general confederation of International Science and Technological Organizations for Development, 1982-1985.
Author: Theorie des bornologies et applications, 1977. Bornologies and Functional Analysis, 1977. Nuclear and Conuclear Spaces, 1981.
Also numerous articles on mathematics, sci and technical policies. President French section Union des Populations du Cameroun, 1962-1963, director external relations, 1963-1966.
Fellow, African Academy of Sciences at Nairobi. Member African Mathematics Union (president 1976-1986), African Association for Advancement of Science and Technology (president since 1978), International Centre for Pure and Applied Mathematics (president since 1979), Society Lyonnaise des Eaux (member international advisory committee, Paris, since 1985), International Mathematics Union (chairman commission on development and exchange 1978-1986), Centre Mondial Informatique et Resource Humaine (member science council, Paris 1982-1984), International Union Technology Association (vice president 1985).