Professor, University of Colorado at Boulder

Douglas Provostial Professor, Stanford University

University of Massachusetts-Amherst USA and Northeastern University, Shenyang, China

Professor, Dept. Environmental Sciences, University of Virginia

Cary Institute of Ecosystem Studies

Cornell Universty

Cornell University

University of Hawaii

Soil Science of Temperate Ecosystems, Agricultural Soil Science, University of Göttingen

University of Maryland Center for Environmental Science, Appalachian Laboratory