1956 - 59 Research Scholar and Geologist, Falkland Islands Dependencies Survey (British Antarctic Survey)
1959 - 62 Overseas Geological Survey in British Guiana
1963 - 67 Lecturer, Fourah Bay College Sierra Leone
1967 - 70 Senior Lecturer, University of Sierra Leone
1970 - 72 Professor and Head of Department of Geology, The University of Sierra Leone
1972 - 88 Professor and Head of Geological Sciences, University of Aston
1988 - 96 Professor and Head of School of Earth Sciences, University of Birmingham
to date Emeritus Professor University of Birmingham