Research Fellow, Institute of Development Studies, University of Sussex

New York University

Professor and Cooperative Extension Specialist, University of California - Berkeley

Professor, Durham University, UK

Agricultural Economist (retired) World Agroforestry Centre, ICRAF

Swette Center for Sustainable Food Systems, Arizona State University

Professor of Autism Studies, University of Birmingham

University of Victoria

University of New South Wales

Professor Emeritus - Western New Mexico University