December 1989 to present date: Lecturer of Chemical Kinetics & Catalysis, Chemical Thermodynamics and Applied Chemistry. Department of Chemistry, Higher Teachers’ Training College (ENS) Yaounde, University of Yaounde I.
1999 to 2002: Visiting Lecturer of Chemical Process Technology Department of Chemistry, Faculty of Science University of Buea.
October 1988 to December 1989: Full-time Lecturer (Assistant) in the Chemistry Department at E.N.S. University of Yaounde, Cameroon
1987 to 1989: Part-time lecturer in the Physical Science Department of E.N.S., University of Yaounde, Cameroon.
September 1976 to September 1977: Mathematics and Physics teacher in Saint Joseph College Sasse, Buea, Cameroon.