Current- Professor, School of Engineering and Computer Science, Hebrew University, Jerusalem
2010 – 14 Member of the scientific Council, The European Research Council
2006 – 06 Visiting Professor, Cornell University
2005 – 06 Chairman, Computer Science Studies Evaluation Committee, The Council for Higher Education (MALAG)
2003 – 05 Chairman, Advisory Committee to the Ministry of Law on Digital Signatures
2002 – 02 Visiting Professor, Johns Hopkins University
1999 – 02 Director, School of Engineering and Computer Science, Hebrew University, Jerusalem
1998 – 99 Chairman, Institute of Computer Science, Hebrew University, Jerusalemg
1994 – 98 Chairman, The National Committee for Information Technology and Infrastructure
1996 – 98 Eu Commission, Science and Technology, representative of Israel
1992 – 98 Chairman, The Inter University Computation Center (MACHBA)
1992 – 98 Chairman, The Computer Infrastructure Committee, The Planning and Budgeting Committee (VATAT).
1987 – 93 Research Staff Member, IBM Almaden Research Center
1985 – 87 Chairman, Computer Science Studies, Hebrew University, Jerusalem
1982 – Computer Science Department, Hebrew University, Jerusalem
1982 – 87 Consultant to IBM, Almaden Research Center
1981 – 82 Visiting Scientist, IBM Research, San Jose
1979 – 81 Post Doctoral Scholar, Stanford University
1978 – 79 Visiting Lecturer, Hebrew University, Jerusalem
1973 – 79 Systems analyst. Developing real time systems