University of Freiburg

Emeritus Professor of Botany, University of Hawaii

Professor of Nature Conservation

Emeritus Professor, University of Queensland

Professor of Ecosystem Science/Plant Ecology, Technische Universität Berlin, Germany

University of Oldenburg, Germany

University of Kassel

University of Virginia, Department of Anthropology

Project Scientist, National Center for Atmospheric Research

senior scientist, Alterra, Wageningen University and Research Centre