Steve is leading the development of the Threshold 21 Ethiopia model. The purpose of the modeling project is to support national planning and policy for long-term food security, rural poverty alleviation, and sustainable agriculture in Ethiopia. The primary client is the Ethiopian National Planning Commission. Currently Steve is also developing with local and international collaborators a systems model to be used as a tool for development planning in Turkana County, Kenya. Steve has a PhD in System Dynamics and has over 15 years’ experience in System Dynamics modeling for sustainability in agriculture, aquaculture, land use management and other natural resource dependent systems. Steve has published modeling work in System Dynamics Review and the Journal of Ecological Economics.