1. Chemist in charge, Scientific Research Section, Crime Detection Laboratory, Royal Canadian Mounted Police, Ottawa.
2. Pathologist, Winnipeg General Hospital; and Assistant Professor of Pathology, University of Manitoba, Winnipeg.
3. Assistant Professor of Pharmacology, University of Toronto; and Director, Attorney-General's Laboratory, Province of Ontario, Toronto.
4. Professor of Pharmacology, Faculty of Medicine, University of Toronto, Toronto.
5. Formerly Mathematician, Crime Detection Laboratory, Royal Canadian Mounted Police, Ottawa; now Statistician, Dominion Bureau of Statistics, Ottawa.
6. Formerly Psychologist, Crime Detection Laboratory, Royal Canadian Mounted Police, Ottawa.