Apollo Program Professor of Astronautics and Engineering Systems, MIT

Harvard-Smithsonian Center for Astrophysics

Nortwestern polytechnical University

McGill University

Professor of Astronautics, University of Southern California

Professor, Dept. of Mechanical and Aerospace Engineering, Naval Postgraduate School

Xenoscience

Senior research scientist (Directeur de Recherche), HDR, ONERA

Czech technical university in Prague

Professor of Physics, CUNY