Research Scientist, Department of Physics
University Distinguished Professor, Department of Chemical and Environmental Engineering
Associate Professor, Department of Hydrology and Atmospheric Sciences
Professor, Department of Geosciences
Professor, School of Geography & Development
Senior Vice President, Academic Affairs & Provost
Dean, Graduate College; Associate Vice President for Research
Associate Professor, Department of Environmental Science
Associate Extension Specialist, Department of Environmental Science
Research Scientist, Department of Geosciences
Co-Manager, UA Environmental Isotope Laboratory
Researcher, Department of Hydrology and Atmospheric Sciences
Associate Specialist; Associate Professor, School of Natural Resources and the Environment
Director, Water, Society & Policy Master's Degree Program
Deputy Director, Institute of the Environment
Regents Professor, Laboratory of Tree-Ring Research
Biosphere 2 Institute Steering Committee