Professor of Geography, University of Oregon

Department of Earth, Energy, and Environment, University of Calgary

Curator and Senior Scientist, Department of Paleobiology, National Museum of Natural …

Scientist Emeritus, US Geological Survey; Professor Emeritus, University of Wyoming

Universitat Rovira i Virgili. Dept. HIstoria i Historia de l'Art (Prehistoria)

Professor of Anthropology, University of Illinois, Urbana

Department of Anthropology Smithsonian National Museum of Natural History

Professor of Earth Sciences, University of Southern California

Professor of Geography, University of Wisconsin

Professor of Ecology, Universidade Federal do Rio Grande do Sul