Robert O'Sullivan D.O. attended University of Health Sciences, College of Osteopathic Medicine for medical school and a residency at Mercy Suburban Hosptial before completing a fellowship in cardiology at Deborah Heart and Lung Center. Dr. O'Sullivan sees patients at our Lansdale locations and is affiliated with Abington Health Lansdale Hospital, Hahnemann, Lankenau, and Mercy Surburban.