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

Regents Professor of Soil Science & Agroecology, Washington State University