1. Private practice, New York, NY.
2. Professor and Department Head, Department of Orthodontics, College of Dentistry, University of Illinois at Chicago, Chicago, Ill.
3. Statistician, Department of Orthodontics, College of Dentistry, College of Dentistry, University of Illinois at Chicago, Chicago, Ill.
4. Associate Professor, Department of Restorative Dentistry, College of Dentistry, University of Illinois at Chicago, Chicago, Ill.
5. Assistant Director, Research and Laboratories, Division of Science, American Dental Association, Chicago, Ill.