Dr. William N. Duffy is a distinguished internal medicine physician and leader who has been practicing in the Philadelphia area for over 30 years. Renowned for his comprehensive approach to patient care, Dr. Duffy serves as both a physician and a lifestyle advocate, guiding his patients towards healthier living through comprehensive lifestyle and nutritional advice. His dedication to his patients and to the field has earned him recognition as a Castle Connolly Top Doctor for over a decade as well as numerous Top Docs designations in Philadelphia Magazine.
He earned his Bachelor of Science degree from Seton Hall University, graduating magna cum laude from Seton Hall University with honors. From there he earned his degree from Georgetown University School of Medicine and returned home to the Philadelphia area to complete his residency in Internal Medicine at Thomas Jefferson University Hospital. Dr. Duffy is board-certified in Internal Medicine and is also a certified personal trainer through the National Academy of Sports Medicine.
Upon completion of his residency, Dr. Duffy started practicing within the Jefferson Health System and maintained his academic responsibilities teaching both students and residents in the hospital and his office. In 2001, he was honored as a teaching attending of the year by the Internal Medicine residency program at Thomas Jefferson University
In 2002 he took the opportunity to work in the University of Pennsylvania Health System and has been there over 20 years. After changing to Penn Medicine, Dr. Duffy maintained his teaching and is an associate professor of clinical medicine at the Perelman School of Medicine. In 2016, he was selected to be one of only 7 physicians in Penn Medicine to be part of Penn Personalized Care (a type of concierge program).
He is an active member of several professional and scientific societies, including the American College of Lifestyle Medicine and the American College of Physicians. Additionally, he contributes to the Culinary Medicine Leadership Board at the Perelman School of Medicine.
Dr. Duffy has held significant teaching and clinical responsibilities, including serving as a past team physician for the Philadelphia Flyers and the Philadelphia Eagles. He is a co-founder and educator in Culinary Medicine at the Perelman School of Medicine and has been a consultant to multiple educational courses for medical students, colleagues and public alike.
With a keen interest in lifestyle medicine, Dr. Duffy focuses on the concept of food as medicine and has delivered numerous talks on plant-based nutrition and culinary medicine. He is passionate about the importance of lifestyle modification in both the prevention and treatment of disease, considering each patient's unique environment and personal circumstances. Dr. Duffy's comprehensive approach to patient care includes discussions on nutrition, exercise, stress management, family support systems, and overall well-being. He strives to collaborate with his patients to help them achieve their best health outcomes.
