1. National Board of Medical Examiners, 3750 Market Street, Philadelphia, PA 19104. His specialization is educational measurement in the health professions.
2. Department of Clinical Epidemiology and Biostatistics, Room 2C14, Health Sciences Centre, McMaster University, Hamilton, Ontario, Canada, L8N 3Z5. His specialization is cognition and assessment.
3. Center for Research on Evaluation, Standards, and Student Testing, University of Colorado-Boulder School of Education, 124 Education, Campus Box 249, Boulder, CO 80309. His specialization is educational measurement.