Distinguished Professor of Ecology, University of California Riverside

Professor, School of Informatics, Computing & Cyber Systems, Northern Arizona University

Associate Professor, Plant Ecology The University of Adelaide

Department of Biology, University of Rochester

California State University, Fullerton

US Forest Service, Rocky Mountain Research Station

Research Ecologist, USDA ARS, Eastern Oregon Agricultural Research Center

Professor of Ecology, Departamento de Biología, Universidad Nacional de San Juan …

Director of Research, Conservation & Collections, Desert Botanical Garden

Associate Professor of Sustainable Arid Lands, University of Nevada, Las Vegas