He joined the botany department at the
University of Birmingham in 1969 as the course tutor for the M.Sc. course in the Conservation and Utilization of Plant Genetic Resources created by
Jack Hawkes. He served the
Botanical Society of the British Isles,
Warwickshire Nature Conservation and the
Birmingham Natural History Society. He was elected a fellow of the
Linnean Society of London. He was Executive Secretary and then first director from 1976 to 1990 at the International Board for Plant Genetic Resources (IBPGR) in
Rome. He was seconded for 2 years in 1976 to IBPGR as Genetic Resources Officer/Senior Genetic Resources Officer in the Crop Ecology and Genetic Resources Unit of the
Food and Agriculture Organization of the United Nations (FAO) in Rome. When he was appointed Executive Secretary of IBPGR in 1978 he resigned from the University of Birmingham. IBPGR was funded by the
Consultative Group on International Agricultural Research (CGIAR) to advance the conservation of plant genetic resources at a time when traditional crop varieties where in danger of being lost. Under his leadership IBPGR helped set up programmes to conserve plant genetic resources, including sponsoring over 800 collecting trips and setting up gene banks. From 1985 he was Executive Secretary of European Cooperative Programme for Plant Genetic Resources (ECP/GR). He left IBPGR (now
Bioversity International) and moved to
Washington, D.C. where he was director of the International Fund for Agricultural Research (IFAR) and IBPGR-sponsored Tropical Trees Program (TTP). He was an advisor on 'Diversity' (published by Genetic Resources Communications Systems) and was a founder member of the
International Centre for Underutilised Crops. In the 1990s, he helped to organize the
International Network for Bamboo and Rattan (INBAR). He was awarded the Jubilee Medal (1977) from the
National Agrarian University, Lima, Peru; a Certificate of Honour for Scientific Excellence from the Royal Government of Thailand (1984) and Certificate of Commendation, Argentina Agricultural Veterinary Academy for services to maize breeding in Latin America (1984). He was an honorary professor at the University of Birmingham (1984). == Personal life ==