1985-1986-Research Officer-Forestry Department, Kenya Agricultural Research Institute
1986-2020-Kenya Forestry Research Institute
Adminstrative Responsibility
1985-1989-Founder Socioeconomics and Policy Research Programme, Kenya Agricultural Research Institute (KALRO)
1991-1997- Project Manager Kenya Japan Social Forestry Training Project, Kitui,Coordinator, Tiva dryland forestry technology development and species and provenance trials and Lower level training courses on nursery and forestry for eastern drylands in Kenya
1997-1999 Regional Director, Dryland Eco-Region Research Programme, Kitui. Coordinator, Research problem identification, planning, implementation, monitoring evaluation and co-ordination of dryland forestry research and development in the country.
2003-2014 Regional Director, Rift Valley Eco-Regional Research Programme. Coordinator, research problem identification, planning, implementation, monitoring, evaluation and co-ordination of montane natural forests, plantation and Dryland Research in Rift Valley.
2014-2018-Deputy Director, Socioeconomic, Policy and Governance Research Theme, KEFR Headquarters
2019-2020- Director, Chief Executive Officer, Kenya Forestry Research Institute, Coordinator: Research planning, implementation, monitoring and evaluation. Resource mobilization, disbursement and prioritization research projects in accordance to KEFRI Strategic Plan 2013-2018