David U. Himmelstein is an American academic physician specializing in internal medicine. He is a distinguished professor of public health and health policy in the CUNY School of Public Health at Hunter College, an adjunct clinical professor at Albert Einstein College of Medicine, and a lecturer at Harvard Medical School. He is also the co-founder (with Steffie Woolhandler) of Physicians for a National Health Program, an organization advocating for single-payer healthcare in the United States.