Technical Program Committee, 1993 IEEE MTT Intl. Microwave Symposium in Atlanta, Ga, June 14-18, 1993.
Technical Program Committee, 1993 IEEE AP & URSI Symposium in Ann Arbor, June 27 - July 2, 1993.
International Advisory Committee, 1994 International Conference on Computational Electromagnetics and its Applications (ICCEA'94) in Beijing, China.
Co-Chairman of IEEE-MTT Technical Committee on Field Theory. (MTT-15).
Editorial Boards of IEEE Transactions on Microwave Theory and Techniques, IEEE Transactions on Antennas and Propagation, IEE Proceedings on Microwaves, Optics, and Acoustics, International Journal of Microwave and MM-Wave Computer Aided Design.
Managing Editor, International Journal of Numerical Modelling, (Electronic Networks, Devices and Fields).
Scientific Advisory Board, Ferdinand Braun Institut, Berlin, Germany.