• U.S. Government Agencies (NSA, CIA, FBI, DoD, DCA, U.S. Weapon Systems, NASA, Lockheed, NAVY, Air Force, ARMY, County of Marin, Bay Area Air Quality Management, etc.)
• Commercial industries such as Citrix, Symantec, Wincom Systems, Cisco Systems, Inc., University of California - Santa Cruz Extension, University of California - Berkeley Extension, Madge Networks, Semaphore Communication Corp, Apple Computer, 3COM Corp, WatchGuard, WWP, CloudShield, and Extreme Networks.
• Korea industries such as KIST, KAIST, Seoul National University, Korea University, Korea Institute For Defense Analyses, Dong-Eui University, ETRI, Chungbuk National University, Samsung Electronics Co., Ltd. for seminars since 1977.