Professor Michieka is a member of staff at the University of Nairobi and has specialized in Agriculture (Weed Science) and Environmental Sciences. He went for a Postdoctoral training at the International Institute of Tropical Agriculture (IITA) prior to his appointment at the University of Nairobi as a lecturer in 1980. He later became the Founding Vice Chancellor of the Jomo Kenyatta University of Agriculture and Technology where he served for 13 years.  Prof Michieka was later appointed the Director General of the National Environment Management Authority, NEMA, where he articulated the dangers of environmental pollution and natural resources degradation. He was responsible for the production of Kenya’s first report on the State of our Environment. Professor Michieka has done extensive research in Weed Science, with special emphasis on appropriate management systems, water conservation and food security. His studies in the testing of herbicides assisted in the recommendations of various weed control methods to farmers in East Africa and beyond.