He specializes in pediatrics and in infectious diseases, with a particular interest in infection control and quality improvement in health care. He did his undergraduate studies at the University of Pennsylvania, graduating in 1981. He received his medical degree from New York University School of Medicine, along with a concurrent PhD from the same institution, both in 1988. He completed a residency in pediatrics and a fellowship in pediatric infectious diseases at Boston City Hospital (now known as Boston Medical Center).