University of Alberta

Merit Researcher, Natural History Museum, London

Professor of Anatomy, Ohio University Heritage College of Osteopathic Medicine

Professor of Palaeontology and Evolution, University of Edinburgh

Professor & Curator, University of Michigan

Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Portugal

Professor of Palaeobiology, School of Earth Sciences, University of Bristol

Curator of Dinosauria, Department of Paleobiology, National Museum of Natural History …

Yale University and Dept. of Paleobiology, The National Museum of Natural History …

Profesor Emérito, UAM. Académico Numerario de la RAC, Madrid.