Lehrstuhl für Astronomie, Universität Würzburg

Tsung-Dao Lee Institute, Shanghai Jiao Tong University

Earth, Planetary and Space Sciences, UCLA

Lecturer with Rank of Professor, Princeton University, Princeton Plasma Physics Laboratory

Professor of Physics (Theoretical), The University of Sydney

Professor of Physics and Astronomy, University of Rochester

Professor of Astrophysical Sciences at Princeton University, Distinguished Research Fellow …

Dipartimento di Fisica, Università della Calabria

Professor of Astrophysics, Universidade de Sao Paulo

Naval Research Laboratory