Professor of Stratigraphy and Paleontology, Mansoura University, Egypt

Director manager of central parks of Egypt, Egyptian Environmental Affairs Agency (EEAA), Egypt  

Professor, Keck School of Medicine, University of Southern California

Lecturer of Vertebrate Paleontology, Assiut University (New Valley Branch)

Lecturer and Curator of Vertebrate Palaeontology, Cambridge University

Assistant Curator of Vertebrate Paleontology,Carnegie Museum of Natural History

Associate Professor, Director Museum of Paleontology, Michigan University

Curator of Dinosaurs, Denver Museum of Nature and Science

Professor of Anatomy and Neuroscience, Ohio University

Associate Professor of Anatomy and Paleontology at OSU-Center for Health Sciences.

Assistant Professor of Biology & National Geographic Explorer

Associate Professor,  University of Alberta

Field Museum of Natural History, Chicago, USA

Ohio University

Ohio University

Associate Professor of Anatomy, Philadelphia College of Osteopathic medicine