- Vienna University of Technology, Vienna, Austria
Summer 2005,
- Princeton University
1995-1996, Visiting Research Collaborator, Dept. of Electrical Engineering,
- City University of New York
1/1996-6/1996, Visiting Research Scholar, Ph. D Program of Computer Science, Graduate School
- Colorado State University, Ft.Collins, CO
1986-1987, Visiting Professor, Dept. of Computer Science and Adjunct member of Firmware Engineering Lab
- New York University
1979-1982, Visiting Scientist, Dept. of Computer Science, Courant Institute
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