Donald Barr is a Professor of Pediatrics in the Stanford School of Medicine, and Professor by Courtesy in the Graduate School of Education. He teaches in the Undergraduate Program in Human Biology, where he helped to found Human Biology's curriculum in health policy. His research has studied the effect of the organizational structure of the U.S. medical care delivery system on the quality of primary care. He has also studied cultural and linguistic barriers to health care access for low-income patients, and factors associated with higher rates of attrition from pre-medical studies among minority students at Stanford and other universities. The fourth edition of his book, Introduction to U.S. Health Policy: The Organization, Financing, and Delivery of Health Care in America, was published in 2016. The third edition of his book, Health Disparities in the United States: Social Class, Race, Ethnicity and the Social Determinants of Health, was published in 2019. In June 2003 Dr. Barr was awarded the Lloyd W. Dinkelspiel Award for Distinctive Contribution to Undergraduate Education at Stanford University. In 2006 he received the Miriam Aaron Roland Prize, which recognizes Stanford faculty who engage and involve students in integrating academic scholarship with significant and meaningful volunteer service to society.