Holds a PhD in Natural Resource Management from Wageningen University & Research Centre, Netherlands; MFor Sc in Soil fertility from the University of Melbourne, Australia; and a BSc (Hons) in Chemistry from the University of Nairobi. Has previously worked as a senior scientist at the Tea Research Foundation of Kenya and the Kenya Forestry Research Institute. Main research interest areas are; chemistry of acid soils, fertilizers, soil fertility and plant nutrition, and GxExM interactions in agro-ecosystems. Has published widely and contributed towards development of many policy documents in the agriculture sector. He is also actively involved in professional training in his area of specialization.