Organizer of various symposiums at AICHE National Meetings and Joint Automatic Control Conferences, 1966-1972.

Invited keynote lecturer at various scientific and technical meetings.

Organizer of Bellman Continuum Workshops and conference committee, 1985-now.

Organizer of various symposiums on fuzzy set theory and uncertainty reasoning, 1987-now.

External Ph.D. dissertation examiner for various universities in Canada, India, Singapore, Hong Kong, Australia 1970- now.

 National Research Council, Panelist and reviewer, 1989- now.

 Invited special lecturer, Lectureship Program, National Research council, Taiwan, ROC, 1991-1992, 2001-2002.

 Visiting faculty researcher, Air Force Logistics Command, 1983.

  International Program Committee, The Eighth International Fuzzy Systems Association World Congress, 1999.

  Member of the organizational committee of the International Conference on Information and Management Science, 2003-now.