| Period | Position |
| September 1988 – August 1992 | Assistant Research Officer (ARO) |
| March 1992 – August 1996 | Research Officer II (RO II) |
| September 1996 – June 2004 | Research Officer I (RO I) |
| July 2004 – July 2011 | Senior Research Officer (SRO) |
| August 2011 - date | Principal Research Officer (PRO) |
| Period | Posting |
| 1988 - 1991 | KEFRI/KARI/ICRAF AFRENA Project at the National Agroforestry Research Centre, Maseno, Western Kenya |
| 1991 - 1994 | University of British Columbia (UBC), Canada: MSc (Forestry) degree programme at UBC |
| 1994 - 1998 | Agroforestry department, KEFRI Headquarters, Muguga in Central Kenya: Organization of the First Kenya National Agroforestry Conference, 25-29 March, 1996 (member of secretariat); Resident lecturer for the Kenya/Japan Social Forestry Training Project |
| 1998 - 1999 | KEFRI/BADC Agroforestry for Integrated Development in Semi-arid Areas of Kenya (ARIDSAK) Project based at the KEFRI Research sub-centre in Kibwezi, Eastern Kenya; Project management (acting Project Manager, co-opted secretariat to Project Management Committee (PMC) |
| 1999 - 2000 | Goethe Institute in Goettingen, Germany: Intensive 4-month German language course |
| 2000 - 2001 | Georg-August University, Goettingen: Graduate visit to the Institute of Silviculture, University of Goettingen; Initiation of a PhD thesis proposal on sandwich programme |
| 2001 - 2007 | KEFRI/BTC ARIDSAK Project, Kibwezi; Egerton University, Njoro: Thesis research for a PhD degree at Egerton University |
| 2007 - 2010 | KEFRI Londiani Regional Research Centre; Egerton University, Njoro: Thesis research for a PhD degree at Egerton University |
| 2010-Sept 2019 | KEFRI Rift Valley Eco-region Research Programme, Londiani; (a) Green Zones Development Support Programme (Funding: ADP), (b) Mainstreaming Sustainable Land Management in Agro-pastoral Production Systems of Kenya (Funding: GoK, GEF, UNDP-Kenya); (c) Regional Project Leader (RPL), the Water Towers Protection and Climate Change Mitigation and Adaptation (WaTER) Programme (Funding: EU); Acting Regional Director (Jan – Feb 2019); |
| Oct 2019-Nov 2021 | KEFRI Turkana Forestry Research Sub-centre, Lodwar: Assistant Regional Director |
| Dec 2021-date | KEFRI Baringo Forestry Research Sub-centre, Marigat Principal Research Scientist |
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