- 2000/04 - Ritsumeikan Asia Pacific University, Japan. Asia Pacific Studies. Professor
- 1999 - 2000 King Fahd University of Petroleum and Minerals, Dahran , Saudi Arabia. Visiting Professor
- 2000/01 - Ritsumeikan Asia Pacific University Japan
- 1989/07 - 1999 Gadjah Mada University, Faculty of Science and Math. Associate Professor
- 1989/07 - 1999 Gadjah Mada University Faculty of Science and Math
- 1996/02 - 1997 Sahid University, Jakarta. MBA Program. Visiting Lecturer
- 1992 - 1997 ICTP (International Centre for Theoretical Physics) - UNESCO. Research associate in developing countries
- 1992/05 - 1996 Indonesian Ministry of Education and Culture, Computerized National Library Systems. Technical consultant
- 1992/05 - 1996 Indonesian Ministry of Education and Culture Technical Consultant for Computerized National Library Systems
- 1990/05 - 1995 Gadjah Mada University, Computer Center. Head of Research and Development
- 1990/05 - 1995 Gadjah Mada University Computer Center Head of Research and Development
- 1988/07 - 1989 Washington State University, USA, Electrical & Computer Engineering. Lecturer
- 1986/08 - 1988 Washington State University, Electrical & Computer Engineering. Research Assistant
- 1986/08 - 1988 Washington State University Electrical & Computer Engineering Research Assistant
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Indonesian Physics Society (HFI)
, Institute of Electrical and Electronics Engineers (IEEE) - Computer Society
, Association for Computing Machinery (ACM)
, Scientific American