European Weed Research Society. International Weed Science Society.
Head, Agrochemicals & Residues Section, Joint Food and Agriculture Organisation/International Atomic Energy Agency Division of Nuclear Techniques in Food & Agr, International Atomic Energy Agency since 1991. Independent Consultant, United Kingdom, 1986-1991. Leader, Herbicide Group, Weed Science Department, Agr & Food Rch Council, Weed Rch Organization, United Kingdom, 1962-1986.
Rch Fellow, Soil Science Department, University of Aberdeen, United Kingdom, 1961-1962.