Professor, University of Colorado at Boulder

University of California, Berkeley

The University of Manchester, Manchester, UK

Professor of Ecosystem Science, University of Oxford

Profesor Facultad de Agronomía and IFEVA - UBA and CONICET

Northern Arizona University

University of New Hampshire

Professor, Dept. of Ecology and Evolutionary Biology, University of Michigan

University of Minnesota

Burton V. Barnes Collegiate Professor of Ecology, University of Michigan