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- "Post doctorate researcher", Waseda University, Tokyo, Japan, 1989-1990
- "Visiting Researcher", Tokyo metropolitan institute of gerontology, Tokyo, Japan, 1991-1994
- "Visiting Researcher", Research and development corporation of Japan (JRDC),1991
- "Assistant Professor", Department of Computer Engineering, Sharif University of Technology, Tehran, Iran, 1995-2006
- "Visiting Scholar", Global Information and Telecommunication Institiute, Waseda University, Tokyo, Japan, Oct 2006-Sept 2007
- "Associate Professor", Department of Computer Engineering, Sharif University of Technolofy, Tehran, Iran, Sept 2007 ~
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