Professor, University of Colorado at Boulder

Distinguished Professor of Biometeorology at the University of California, Berkeley

Professor of Ecosystem Science, University of Oxford

The University of Manchester, Manchester, UK

Cornell University

Odum Professor of Ecology, University of Wisconsin-Madison

Profesor Facultad de Agronomía and IFEVA - UBA and CONICET

Senior Scientist: US Geological Survey - Ecology

University of Minnesota

Northern Arizona University