professor of electrical engineering, The University of Texas at Arlington

Lebanese American University,Beirut, Professor at Institute of Space Sciences,Bucharest

professor emeritus, University of Rome "La Sapienza"

City University of Hong Kong (was with HK Polytechnic Univ.)

UCLA

Nanjing University of Aeronautics and Astronautics

Imperial College London and University of Rome Tor Vergata

Università di Napoli Federico II

cornell university