Curator of Paleobotany, Florida Museum of Natural History, University of Florida

University of Michigan

Indiana University Southeast

USGS and Dept. Paleobiology, National Museum of Natural History, Smithsonian Institution

Professor Emeritus, Ain Shams University

Collections Manager Paleobotany

University of Michigan

Investigador Asistente, CECOAL (CONICET)-Universidad Nacional del Nordeste

PhD, Ain Shams University