Killam Memorial Professor of Ecology, University of Alberta

Professor of Microbiology, University of Massachusetts

Douglas Provostial Professor, Stanford University

Professor, University of Colorado at Boulder

Scientist III, GESTAR/USRA, NASA Goddard Space Flight Center

Max-Planck-Institute for Biogeochemistry, Jena, Germany

Cary Institute of Ecosystem Studies

Cornell Universty

Professor, Dept. Environmental Sciences, University of Virginia

Professor of Soil and Environmental Chemistry