Jeffrey P. Greenfield, M.D., Ph.D.

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1305 York Ave Fl 9
New York, NY 10021
Jeffrey Greenfield, MD, PhD is a board-certified neurosurgeon who specializes in pediatric neurosurgery. In addition he sees certain adult patients with congenital neurosurgical conditions. Compassionate clinical care, research, and education are all central to his philosophy as a neurosurgeon and physician.His clinical expertise includes Chiari malformation, all forms of tethered spinal cord, pediatric brain tumors and congenital neurosugery into adulthood. As creator and director of the Chiari CARE program, Dr. Greenfield has developed an international reputation caring for children and adults with Chiari malformation, tethered cord, syringomyelia, and other associated conditions such as craniocervical instability, CSF leaks, and hydrocephalus as part of a large multidisciplinary team.Dr. Greenfield is a strong proponent of the unique concept of transitional or congenital neurosurgery – caring for patients with specific conditions from childhood through adulthood.BLOG POST: Patients As Partners Dr. Greenfield writes about the importance of engaging and empowering even his youngest patientsDr. Greenfield also directs the pediatric skull base surgery program, evaluating and removing tumors of the pituitary gland region and skull base such as craniopharyngiomas with minimally invasive endoscopic tools. Dr. Greenfield is also an expert in utilizing minimally invasive ventricular endoscopy of the brain to treat tumors, hydrocephalus, and cysts within the ventricles, and intraoperative brain and spine mapping and imaging to care for children with benign and malignant tumors of the brain and spine.~~~Looking for a second opinion? Dr. Greenfield can review your scans: Click here to upload your images. (If you do not have an account simply enter your email address and you will be prompted to create an account. Instructions here.)~~~Dr. Greenfield sees patients at:1305 York Avenue (at 70th Street), 9th Floor New York, NY 10065~~~For more information about Dr. Greenfield, visit https://neurosurgery.weillcornell.orgTo make an appointment, please call 212-746-2363. Weill Cornell Pediatric Neurosurgery https://neurosurgery.weillcornell.org/pediatricChildren's Brain Tumor Project https://childrensbraintumorproject.org
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Sebastian A. Mayer, M.D.
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PROFESSIONAL TRAINING:Research Associate, Department of Nuclear Medicine, University of Vienna, 1998-2000Residency in Internal Medicine, St. Luke’s Hospital Center, New York, 2000-2003Fellowship in Hematology/Oncology, Mt. Sinai Medical Center, New York, 2003-2006Fellowship in Stem Cell Transplantation, Memorial Sloan Kettering Cancer Center, New York, 2007-2008Sebastian Mayer has been an attending physician on the Blood and Marrow Transplantation service at Weill Cornell Medical Center since 2010, after working on the Leukemia Service for two years.A native of Austria, he earned his MD at the University of Vienna with a Doctoral thesis in experimental nuclear medicine. After two years of nuclear medicine research in Vienna, Dr. Mayer completed his Internal Medicine residency at St. Luke’s Roosevelt Hospital center in New York. During that time, he participated in research projects on the molecular biology of lymphoma at Mount Sinai Medical Center and Albert Einstein College of Medicine.After a fellowship in Hematology/Oncology and a subsequent faculty appointment at Mount Sinai Medical Center, he completed a fellowship in Stem Cell Transplantation at Memorial Sloan Kettering Cancer Center.His main research interests lie in the reversal of chemotherapy resistance in leukemia before stem cell transplant, specifically for patients with a high risk of disease recurrence. He also is an active investigator in the treatment of graft versus host disease, a feared complication of stem cell transplant, as well as the prevention and management of transplant rejection.Dr. Mayer greatly enjoys the close interaction with his patients and also takes an active role in the education of junior physicians and medical students.
Hai Hiep Hoang, M.D.
Internal medicine practitioners

Hai Hiep Hoang, M.D.

Dr. Hai “Ethan” Hoang is an Assistant Professor of Clinical Neurology and Assistant Attending Neurologist at Weill Cornell Medical College/New York Presbyterian Hospital, specializing in neuroinfectious and neuroimmunologic diseases.Dr. Hoang earned his B.S. from University of Texas at Austin with a concentration in Human Biology, and his M.D. from Texas A&M College of Medicine. He completed his internship at Baylor College of Medicine and subsequent adult neurology residency at the prestigious Washington University School of Medicine in St. Louis where he served as chief resident during his final year. He then completed a neuroinfectious and neuroimmunology fellowship at the Icahn School of Medicine at The Mount Sinai Hospital. He is board certified by the American Board of Psychiatry and Neurology and is a member of the New York Encephalitis Consortium and American Academy of Neurology where he has published a number of articles in peer-reviewed journals.Dr. Hoang integrates his diverse regional experiences from around the country and offers a unique perspective in diagnosing and managing neuro-infectious and -immunologic diseases including encephalitis and meningitis caused by herpes, HIV, COVID, NMDA, and other rare diseases. He also sees patients who have had complications including headaches, seizures, neuropathy, and cognitive concerns from the above diseases. He has additional expertise in headache medicine and botulinum toxin for chronic migraines.Dr. Hoang’s other interest includes neurology education. He is a proponent for developing accessible avenues that translate the complex nervous system in a simple, individualized manner; for all to comprehend.
United StatesNew YorkNew YorkJeffrey P. Greenfield, M.D., Ph.D.

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