Dr Hennessey is Director of Clinical Endocrinology at Beth Israel Deaconess Medical Center and Associate Professor of Medicine at the Harvard medical School. He graduated from the Medical Faculty of the Karl Franzens University in Graz Austria. He completed a Medical Residency at the New Britain Hospital in Connecticut. He served with the USAF as an Internist/Flight Surgeon and later subspecialty training in endocrinology and metabolism at the Walter Reed Army Medical Center in Washington DC where he conducted research in thyroxine bioequivalence.

Dr Hennessey served as the Chief of Endocrinology at USAF Medical Center Wright-Patterson in Ohio and later joined the faculty at Wright State University School of Medicine as the Director of Clinical Clerkships, maintaining a clinical-teaching practice at Wright State and in thyroidology at Wright-Patterson Medical Center. Upon arrival at Brown Medical School in Providence RI, he transferred to the Air National Guard as a flight surgeon and finally as Rhode Island State Surgeon, retiring after a 25 year USAF career in 2006. While at Brown, he was Associate Director for Clinical Education in the Division of Endocrinology at Rhode Island Hospital and directed the Medical School Endocrine Pathophysiology course.

Dr Hennessey’s career has focused on the clinical education of medical students, resident physicians in internal medicine, and fellows in endocrinology and metabolism. In this capacity he has conducted lectures, precepted clinical care, and carried out original and sponsored clinical research with his trainees. Currently, he is pursuing his clinical interest in thyroid disease and osteoporosis with both expanding clinical programs.