According to his website:
Dr. Harvey S. Marchbein is a practicing, board certified Obstetrician-Gynecologist licensed in the state of New York and is a Senior Attending at North Shore University Hospital in Manhasset. He is a Fellow of the American College of Obstetrics and Gynecology (FACOG) as well as the American College of Surgeons (FACS). Dr. Marchbein has been performing circumcisions since 1975. He is considered an expert in newborn circumcision and administration of local anesthesia and gives lectures on both surgical and anesthesia techniques. He completed the Brit Kodesh curriculum of the Rabbinical Assembly at The Jewish Theological Seminary in New York City for physician Mohalim in 2003. His Brit Milah practice encompasses the areas of Long Island (Nassau and Suffolk), the 5 boroughs of New York City and Westchester.