Professor of Stratigraphy and Paleontology, Mansoura University, Egypt

Professor of Anatomy and Neuroscience, Ohio University

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

Associate Professor,  University of Alberta

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.

Ohio University