This thesis examines the history of Fulbourn Hospital in Cambridgeshire from 1953 to 1995 through oral histories and documents. It explores how models of mental illness and therapeutic practices changed over this period. The appointment of Dr. David Clark in 1953 initiated reforms implementing a social model of psychiatry. This transformed the hospital. However, the appointment of Professor Sir Martin Roth in 1976 shifted the focus back to a medical model. Later, care moved to community settings through group homes and mental health teams. While psychiatrists abandoned the social model, elements were absorbed into nursing practices. The study illustrates how professional boundaries shifted with changing models of practice.