Donald A. BarrDonald A. Barr, MD, PhD (PALO ALTO, CA), is professor emeritus at Stanford University in the Department of Pediatrics. He lives in Palo Alto, California. He is the author of Health Disparities in the United States: Social Class, Race, Ethniity, and the Social Determinants of Health; Introduction to Biosocial Medicine: The Social, Psychological, and Biological Determinants of Human Behavior and Well-Being; and Crossing the American Health Care Chasm: Finding the Path to Bipartisan Collaboration in National Health Care Policy. Read More Read Less