An Environmental archaeologist who has excavated in southern Nigerian, Igboland and Yorubaland.  With his major interest on archaeopalynology, he uses the study of pollen, spores and certain microscopic plankton organisms as a tool to understand human-environment interactions with the aim of uncovering natural and cultural phenomena, and processes which drive landscape evolution. He is currently British Academy Newton International Fellow McDonald Institute for Archaeological Research, University of Cambridge, UK.