Sammy holds a BSc in Horticulture from the Jomo Kenyatta University of Agriculture and Technology (Kenya) and a Masters and Doctorate Degrees in Sustainable Agriculture and Rural Development from the University of the Free State, South Africa.

His work involves implementing several multi-partner research and development programmes in agroforestry, in partnership with National Agricultural Research Systems (NARS), universities, extension services, government ministries, regional institutes, NGOs, farmers and policy/advocacy groups.His research interests include designing and implementing agricultural/agroforestry trials, conducting participatory tree domestication research, smallholder farming systems analysis, and developing training modules