Technical Program Committee, 1994 IEEE MTT Intl. Microwave Symposium in San Diego, CA May 23-27, 1994.
Technical Program Committee, 1994 IEEE AP & URSI Symposium in Seattle, WA, June 19 - 24, 1994.
Technical Program Committee, 1995 IEEE MTT Intl. Microwave Symposium in Orlando, Florida, May 15-19, 1995
Technical Program Committee, 1994 IEEE AP & URSI Symposium in Newport Beach, CA, June 18 - 23, 1995.
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).
Guest Editor, Special Issue on Time Domain Techniques, International Journal of Microwave and MM-Wave Computer Aided Design.
Scientific Advisory Board, Ferdinand Braun Institut, Berlin, Germany.
