Postdoctoral Fellow, Dept. of Medical Biophysics, University of Toronto.

Assistant Professor, Dept. of Radiology, University of Toronto.

Senior Scientist, Physics Division, Ontario Cancer Institute.

Assistant Professor, Dept. of Medical Biophysics, University of Toronto.

Associate Professor, Depts. of Radiology and Medical Biophysics, University of Toronto.

Special Staff, Dept. of Radiological Sciences, Toronto General Hospital.

Acting Director of the Radiological Research Laboratories, Dept. of Radiology, University of Toronto.

Director of the Imaging Research Laboratories, The John P. Robarts Research Institute, London, Ontario.

Professor, Dept. of Diag. Radiology and Nuclear Medicine, The University of Western Ontario.

Professor, Dept. of Medical Biophysics, The University of Western Ontario.

Adjunct Professor, Dept. of Electrical Engineering, The University of Western Ontario.

Adjunct Professor, Dept. of Physics, The University of Western Ontario.

Fellow of the Canadian College of Physicists in Medicine

Honorary Lecturer, Dept. of Oncology, The University of Western Ontario.

Chairman, Biomedical Engineering Research and Graduate Studies Group, Faculty of Engineering, The University of Western Ontario.

Vice-president of the Canadian College of Physicists in Medicine

Chairman of the Canadian Organization of Medical Physicists

Professor, Dept. of Oncology, The University of Western Ontario

Director, Graduate Program in Biomedical Engineering, The University of Western Ontario