1. Assistant Professor, Department of Anesthesia, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania.
2. Research Assistant, Department of Pharmacology, Georgetown University Schools of Medicine and Dentistry, Washington, D. C.
3. Professor and Chairman, Department of Pharmacology, Georgetown University Schools of Medicine and Dentistry, Washington, D. C.
4. Associate Professor, Department of Pharmacology, Georgetown University Schools of Medicine and Dentistry, Washington, D. C.