Research on the interaction of people, agriculture and trees at a range of scales from ecophysiological interactions among system components through to landscape level effects, across both temperate and tropical environments, with a focus on multipurpose tree species and farm trees. **Research Areas** Agroforestry with specialisms in: - Role of trees in the agricultural landscape - Formal representation of local ecological knowledge - Tree-crop-soil interactions - Autecology and domestication of indigenous tree species