Professor (titular) of Ecology, University of Fribourg, Switzerland

Research Director, University Côte d'Azur, INRAE, CNRS

Professor in Population Biology, University of Amsteram

Professor of Entomology, Wageningen University, The Netherlands

University Distinguished Professor of Entomology, Michigan State University

Professor of Entomology,Banaras Hindu University

University of Florida

University of California Santa Barbara

Distinguished Professor Emeritus, Rutgers University

Director R&D Biobest, Professor Plant-Insect Interactions Lancaster University