For more than 10 years (1977-1988) served variously as Research Officer, Senior Research Officer and Principal Research Officer with the Coffee Research Foundation, Ruiru, Kenya; with other colleagues developing the Coffee berry disease and rust resistant Coffea arabica cultivar Ruiru 11. As Head of the Coffee Breeding Project (1983-1988) executed the Hybrid Seed Production Program for Ruiru 11 and the National On-Farm trials leading to rapid adoption of Ruiru 11. In       this work, served as lead Scientist for the rust resistance selection program and the innovative hybrid seed production program documented in 12 Annual Progress reports, 6 international/regional symposia proceedings and 8 publications in reputable peer reviewed journals as main author. Between 1989-1994 employed as Associate Research Officer with ICRAF,coordinated the Western Kenya Field work of the German – BMZ funded Multipurpose Tree Improvement Program. As lead Scientist for the reproductive biology and seed systems research component was commended during the Executive Management and Programme Review ( EMPR) of ICRAF by the TAC of the  CGIAR in 1993. This work is documented in 4 Annual reports, 2 international symposia proceedings and 3 publications in peer reviewed international journals in addition to a doctoral thesis. Simultaneously was Resource person for the AFRENA NETWORK Regional Training Course in Multipurpose Tree Improvement. Since 1994 served variously as Lecturer, Senior Lecturer and currently as Associate Professor and currently as Professor of Plant Breeding as well as serves as  Director of International Relations  Interlink at Maseno University. Has also been involved in the development of the MSc Botany (Agroforestry) programme, BEd (Science) and BSc (Hort) programmes; meanwhile was also Ph.D scholar at Moi University. Simultaneously served as consultant to the International Potato Center, CIP; CARE International in Kenya and PLAN International’s Livelihood and Food Security, Western Kenya Extension Project.  In 2004 initiated ‘The Professor Thomas R Odhiambo Memorial Public Lecture series at Maseno University’. Recipient of the 2004, IUCEA, VicRes competitive research grant. Founder and serving member of the executive council of the Plant Breeders’ Association of Kenya (PBAK). Recipient of the 2009, Japanese Ibaraki Kasumigaura prize. Panelist; EUA – AAU, 2010, Academic Mobility Panel of the Access to Success project in African and European Universities. Lead Consultant to NEMA on Kenya’s Tool Kit on Access and Benefit Sharing from Utilization of Genetic Resources, 2014; Panelist, Kenya’s Vision 2030 Review Dialogue Platform 2015