Director and Professor, Florida Museum of Natural History, University of Florida, Gainesville …

Texas A&M University

Professor of Geology, Kent State University

Professor of Earth and Planetary Sciences, University of California, Santa Cruz

Esther Cloudman Dunn Professor of Geosciences, Smith College

Director of Invertebrate Paleontology and Micropaleontology Collections, Florida Museum …

Milwaukee Public Museum, Wisconsin

Department of Geological Sciences, Chungnam National University

Museum für Naturkunde Berlin