Professional Experience

• 2001 - 2005: Associate Dean, School of Engineering and Applied Science
• 1987 - present: Professor, Department of Computer and Information Science (CIS), University of Pennsylvania.
• 1990-1994: Department Chair, CIS, University of Pennsylvania.
• 1979 -1986: Associate Professor, Department of CIS, UPenn
• 1986 - present: Graduate Group, Department of Bioengineering, UPenn.
• 1985 - present: Graduate Group, Department of Mechanical Engineering and Applied Mechanics, UPenn.
• 1974 - 1979: Assistant Professor, Department of CIS, UPenn.
• 1973 - 1974: Lecturer, Department of Computer Science, University of Toronto.