· President, Tel Aviv University2007–2009
· Dean of The Fu Foundation School of Engineering & Applied Science, Columbia University1995–2007
· Chair of the Computer Science Department, Columbia University1989–1994
· Julian Clarence Levi Professor of Mathematical Methods and Computer Science, Columbia University1987–
· Professor, Department of Computer Science, Columbia University1982–
· Chair of the Computer Science Department, Tel Aviv University1979–1982
· Faculty Member, Computer Science Department, Tel Aviv University1976–1995
· Postdoctoral Researcher, IBM1975–1976
· PhD in Computer Science, Cornell University1972–1975
· M.Sc. in Applied Mathematics, Tel Aviv University1970–1971
· B.Sc. in Applied Mathematics, Tel Aviv University1967–1970