Distinguished Professor of Plant Biology and Evolutionary Genomics, Penn State University

Adjunct Professor, Cornell University

Louisiana State University

University of Vienna

Professor of Plant and Environmental Sciences, Virginia Tech

Mary Payne Hogan Distinguished Professor of Botany, Old Dominion University

Wilfrid Laurier University

Professor Emeritus, Weed Science, NCSU

Professor, University of São Paulo

Professor, Manchester Metropolitan University, UK