Dr. Greenfield is a board-certified neurosurgeon who specializes in pediatric neurosurgery and has a special interest in minimally invasive endoscopic approaches that are less traumatic than traditional surgery. He directs the pediatric skull base surgery, epilepsy surgery, and spasticity surgery programs. 

Dr. Greenfield received his M.D. and Ph.D. from the Weill Medical College of Cornell University. Following completion of his neurosurgical residency and chief residency at NewYork-Presbyterian Hospital/Weill Cornell Medical Center, Dr. Greenfield received further training in surgical treatment of brain tumors, epilepsy, spinal dysraphism, complex spinal column injury, spinal cord tumors, and fetal surgery for myelomeningocoele at The Children’s Hospital of Philadelphia.

Dr. Greenfield has an active research interest in low-grade tumor biology and angiogenesis as they relate to pediatric brain tumors, especially rare and inoperable tumors. He has also begun standardizing the analyses of all brain tumor specimens to include advanced genomic analyses with an aim towards specific personalized treatment strategies.