Stephen Duke (Ph.D, Duke University) is Research Leader of the USDA, ARS Natural Products Utilization Unit in Oxford, MS, U.S.A., where he is involved in discovery of natural products for pest management. He is an expert on mode of action of herbicides. He is a Fellow of ACS and AAAS and former Chair of the Agrochemical Division of ACS. He is Editor-in-Chief of the journal Pest Management Science. He is author or co-author of more than 400 peer-reviewed publications. Per Kudsk is Professor and Head of the Crop Health Section at the Department of Agroecology at Aarhus University in Denmark. He is a weed scientist has been involved in research on integrated weed management, herbicide resistance, allelopathy and non-target plant effects of pesticides. He is currently coordinating the EU project IWMPRAISE with 37 partners from 8 countries. He is former President of the European Weed Research Society. He has contributed to more than 200 scientific publications. Keith Solomon is Professor Emeritus in the School of Environmental Sciences at the University of Guelph. He has taught courses in pesticides and environmental risk assessment and conducted research into fate and effects of pesticides and other substances in the environment, exposure of humans to pesticides and industrial chemicals, and risk assessment. He has contributed to more than 460 scientific publications and reports.