Herman J. Geiger (November 11, 1925 – December 28, 2020), known as H. Jack Geiger, was an American physician and civil rights activist. He was a leader in the field of social medicine, the philosophy that doctors had a responsibility to treat the social as well as medical conditions that adversely affected patients' health, famously (and controversially) writing prescriptions for food for impoverished patients with malnutrition. Geiger came to embody the idea of the responsibility of a physician to do something about what is now known as the social determinants of health, believing that medicine could be an instrument of social change. He served patients' medical needs as well as social and economic necessities, which he believed were in large part responsible for the health problems commu