· Researcher - Affiliated Faculty, California Institute of Technology (Caltech) Center for the Mathematics of Information (CMI)2024–
· Carl F. Braun Professor of Engineering and Control & Dynamical Systems, California Institute of Technology1995–2010
· Professor of Mathematics, University of California, Berkeley1972–1995
· Associate Professor of Mathematics, University of California, Berkeley1971–1972
· Assistant Professor of Mathematics, University of California, Berkeley1969–1971
· Ph.D. in Mathematical Physics, Princeton University1968–
· Lecturer in Mathematics, University of California, Berkeley1968–1969
· B.Sc. in Mathematics, University of Toronto1965–