· Director, Institute of Applied Mathematics, University of British Columbia1993–1998
· Professor Emeritus, University of British Columbia1986–
· Associate Professor, University of British Columbia1981–1986
· Assistant Scientist, Medical Research Council (MRC)1975–1976
· Assistant Professor, University of British Columbia1975–1981
· PhD Student, University of Minnesota1975–
· M.Sc., Tel Aviv University1971–
· B.Sc., Tel Aviv University1969–