Liberty Hyde Bailey Professor, Cornell University

Professor, Soil Ecology, Colorado State University

Distinguished Professor, Western Sydney University, Macaulay Institute

Professor, Yale University

Visiting Scholar, Stanford and Scientist Emeritus, USGS

INRAE, Info&Sols, Orléans, France

School of Agriculture & Environment; UWA Institute of Agriculture, University of Western

Chief Scientist-Soil Systems Modeler, International Fertilizer Development Center

University of Colorado

Professor of Plant Pathology, Emerging Pathogens Institute, University of Florida