President of AP-S (1999), Vice President (1998), Nominations Chairman (2000). General Chairman and Organizer of annual Antenna Applications Symposium, 1994-present. Member of Executive Team for IET Professional Network on Antennas and Propagation, 2003-present. AP-S/URSI Symposium and Steering Committee for 1996 Symposium. Technical Program Chair, IEEE 2003 Phased Array Systems and Technology Symposium. Co-Chairman, NASA NMP Technology Workshop/Large, Lightweight Deployable Antennas, 2001. International Visiting Reviewer of Square Kilometer Array Project for Dutch NWO, 2000. Special session organizer at international symposia in Davos, Switzwerland and Salt Lake City, UT, 2000.