An Associate Professor (Range Management), former Head of Department and Acting Dean, University of Nairobi (UON). Holder of PhD (Range Management), University of Wyoming, USA (1990); MSc (Range Management), Texas A&M University (1982); and Bachelor of Science (Agriculture), UON. Principal, Co-Principal or Investigator in several externally funded research projects such as  Making the Best of Climate: Adapting Agriculture to Climate Variability supported by Association for Strengthening Agricultural Research in Eastern and Central Africa (ASARECA); Creating Wealth For Smallholder Farmers in Arid Areas of  Kenya: The Case of Mukau (Melia Volkensii) funded by Government of Kenya/European Union through the Kenya Agricultural Productivity Programme of Kenya; Foe or friend: Management and Utilization of Prosopis juliflora in Kenya, funded by Government of Kenya and European Union through the Kenya Agricultural Productivity Programme of Kenya. Representative the University in Steering Committee of the National Environmental Management Authority (NEMA), and in Management Board of the Wangari Maathai Institute of Peace and Environment (WMI).