Dr. Gelfand is a graduate of the Wharton School of the University of Pennsylvania. He received his MD with honors from the State University of New York Health Sciences Center at Brooklyn. He trained in internal medicine at Mount Sinai Hospital in New York City and completed his fellowship in hematology, bone marrow transplantation and oncology at Cornell University Medical Center in 1996.He is board certified in hematology and oncology.Dr. Gelfand teaches at the New York Presbyterian Hospital/Weill Cornell College of Medicine and lectures around the country in such topics as breast cancer, cancers of the gastrointestinal system and lung cancer.