Dr. Greenberg received his Bachelor of Science degree with honors from the University of Massachusetts and his master's degree in chemistry before receiving his medical degree from the University of Medicine and Dentistry of New Jersey, New Brunswick. He completed his residency in radiation oncology at the Hospital of the University of Pennsylvania, Philadelphia. He is a member of the American Medical Association for Radiation Oncology, American College of Radiology, Medical Society of New Jersey, Oncology Society of New Jersey, and the Mercer County Medical Association. He is the director of radiation oncology at Hunterdon Medical Center, Flemington, New Jersey. Dr. Greenberg has been selected by his peers as a "Top Doctor" in New Jersey.