General Co-Chair, the 8th IEEE World Congress on Services (SERVICES), the 5th IEEE International Conference on Cloud Computing (CLOUD), the 9th IEEE International Conference on Services Computing (SCC), the 19th IEEE International Conference on Web Services (ICWS) and First IEEE International Conference on Mobile Services (MS 2012), sponsored by IEEE Computer Society, Honolulu, Hawaii, June 24-29, 2012.
Co-Chair, Steering Committee, the 3rd International Conference on Human-Centric Computing (HumanCom 2010), Cebu, Philippines, August 11-13, 2010.
Chair, Steering Committee, International Symposium on Autonomous Decentralized Systems, 1995-2001
General Chair, the Second International Symposium on Autonomous Decentralized Systems, Phoenix, Arizona, April 15-17, 1995.
General Co-Chair, the First International, Symposium on Autonomous Decentralized Systems (ISADS), sponsored by IEEE Computer Society, Information Processing Society of Japan, the Society of Instrument and Control Engineers of Japan, Kawasaki, Japan, March 30 – April 1, 1993.
Chairman, Steering Committee, the Annual International Computer Software and Applications Conference (COMPSAC), 1978-2005.
Chairman, the First Annual International Computer Software and Applications Conference (COMPSAC), Chicago, 1977.
Chair, the 11th IEEE Workshop on Future Trends in Distributed Computing Systems (FTDCS), Sedona, Arizona, March 21-23, 2007
Chair, Steering Committee, the IEEE Workshop on Future Trends in Distributed Computing Systems (FTDCS), 1993-present
Chair, Organizing committee of IFIP Congress ’89, 11th World Computer Congress, sponsored by International Federation for Information Processing, San Francisco, August 28-September 1, 1989.
General Chairman, 1974 National Computer Conference, sponsored by American Federation of Information Processing Societies, Association of Computing Machinery, IEEE Computer Society, Society for Computer Simulation, Chicago, May 6-10, 1974