Professor of Stratigraphy and Paleontology, Mansoura University, Egypt
Professor of Anatomy and Neuroscience, Ohio University
Lecturer of Vertebrate Paleontology, Faculty of Science, New Valley University
Adjunct lecturer in the Department of Geology and Environmental Geosciences at the College of Charleston in Charleston, South Carolina.
Field Museum of Natural History, Chicago, USA
Professor, Keck School of Medicine, University of Southern California
Curator of Dinosaurs, Denver Museum of Nature and Science
Professor, University of São Paulo, Brazil
Director manager of central parks of Egypt, Egyptian Environmental Affairs Agency (EEAA), Egypt
Associate Professor, Director Museum of Paleontology, Michigan University
Curator - Division of Fossil Primates - Duke Lemur Center
Assistant Curator of Vertebrate Paleontology, Carnegie Museum of Natural History, USA
Assistant Professor of Biology & National Geographic Explorer
Associate Professor of Anatomy, Philadelphia College of Osteopathic medicine
Lecturer and Curator of Vertebrate Palaeontology, Cambridge University
Associate Professor of Anatomy and Paleontology at OSU-Center for Health Sciences.