European Association of Organic Geochemists.
Senior Assistant Secretary, Intergovernmental Oceanographic Commission, United Nations Educational, Scientific and Cultural Organization since 1991. Assistant Director, 1990-1991, Chief Rch Officer, 1988-1989, Assistant Chief Rch Officer, 1985-1988, Physical & Chem Oceanography Division, Nigerian Institute for Oceanography, Nigeria. Resident Consultant, Oceans & Coastal Areas Program Activities Centre, United Nations Environment Programme, Kenya, 1989.
Visiting Senior Lecturer, Institute of Oceanography, University of Calabar, Nigeria, 1985-1988. Petroleum Engineer(s)/Production Geologist, Petroleum Engineering Department, Shell-Boite Postale Petroleum Development Company, Nigeria, 1975-1977.