Nash graduated as a medical doctor from the University of Rochester (1977-1981). In the following decade he pursued clinical training, research, and teaching at several medical centers including the University of Pennsylvania Hospital (1981-1984), the Robert Wood Johnson Foundation, the Wharton School of the University of Pennsylvania (1984 to 1986), and the University of Pennsylvania Medical School, where he was a faculty member from 1986 to 1990.
Nash joined the Jefferson Medical College in 1990, to be named Dean of the Jefferson College of Population Health in 2008, a position that he occupied until his voluntary resignment in 2019, to remain its Founding Dean Emeritus. At Jefferson he is also Dr. Raymond C. & Doris N. Grandon Professor of Health Policy and Special Assistant at Jefferson Health.
Referred as a leader in the field,[7] Nash's advocacy has focused on promoting accountability, professional autonomy, and training the coming generation of leaders to improve health care.[2] His postulates on population health issues have often sparked public interest.[8][9] Media reporters have noted Nash's beliefs that "factors like behavior, genetics, and environment are more important than medicine in determining a person's health".[10]
Nash has published over four hundred academic papers.[16] His research interests comprehend a wide scope within healthcare. Frequent topics in his most cited papers have been coronary bypass surgery, upper respiratory infections, clinical practice assessment, urinary tract infection, and migraine treatment outcome.[17]
Editorials
Through his writings of editorial articles and other means, for years Nash has been an advocate on many debated subjects in healthcare, including the social determinants of success, consumer's decision-making, the upscaling of services, Israel's public system as a model, and others.[18]
Books
As an author, Nash has published a number of books on healthcare subjects, below a partial list:
Future Practice Alternatives in Medicine, 1993[19]