Dr. O’Neill received his undergraduate degree from the College of William and Mary and his medical degree from Georgetown University School of Medicine. After serving in the US Navy as a medical officer, he completed his dermatology training at Bethesda Naval Hospital. He joined Dr. Jaffe in private practice in 1992 and has been active in the local medical community since then. Dr. O’Neill is a member of the Montgomery County Medical Society and is on staff at Suburban Hospital. He was the past chairman of dermatology at Suburban Hospital. He is also the past president of the Georgetown Clinical Society and Osler Medical Society.