1. Project Assistant, Department of Anesthesia and Critical Care, University of Chicago.
2. Professor and Chairman, Department of Anesthesia and Critical Care; Professor of Medicine, University of Chicago.
3. Assistant Professor, Department of Medicine, University of Chicago.
4. Associate Professor, Department of Statistics, University of Chicago.
5. Professor, Department of Anesthesia, the University of Manitoba, Winnipeg.
6. Associate Professor, Department of Medicine, University of Chicago.