Dr. Daniel Walzman

Christopher Kellner is a Neurosurgery specialist and a Neuroradiologist in New York, New York. Dr. Kellner is rated as an Elite provider by MediFind in the treatment of Apoplexy. His top areas of expertise are Stroke, Subarachnoid Hemorrhage, Subdural Hematoma, Thrombectomy, and Gastrostomy.

"Jamie S. Ullman, MD, FACS, joined Northwell Health in 2013 as director of neurotrauma at the Institute for Neurology and Neurosurgery at North Shore University Hospital. She brings 25 years of specialized expertise in the surgical management of head and spinal cord injuries, as well as acute neurological conditions such as stroke, cerebral hemorrhage, hydrocephalus and brain tumors.A founding member of the Northwell Health Concussion Program, Dr. Ullman leads a team of experts in traumatic brain injury. She also works closely with the neurocritical care team in the Neurosurgery Intensive Care Unit at North Shore University Hospital to deliver comprehensive neurological services to the community.Fully committed to being accessible for her patients, Dr. Ullman is always there to answer questions and address any concerns with kindness and compassion. She takes the time to go over every aspect of care, whether it's reviewing diagnostic films or explaining the thorough details of a procedure.Research is also important to Dr. Ullman. She is actively involved in various neurosurgical clinical trials and studies including intracranial pressure monitoring and minimally invasive removal of blood clots in strokes. Her work has been highlighted in more than 60 medical publications.A recognized leader in her field, Dr. Ullman has received numerous awards from national organizations, including the Distinguished Service Award from the Congress of Neurological Surgeons. She was also nominated for Northwell's President's Award, recognized for her leadership in elevating the neurotrauma program at North Shore University Hospital, the first trauma center in downstate New York to receive level I verification from the American College of Surgeons.Dr. Ullman received her medical training from Robert Wood Johnson Medical School in New Jersey. She completed a residency in neurosurgery and fellowship in neurosurgery critical care at Mount Sinai School of Medicine, and an additional fellowship in neurotrauma at the Shock Trauma Center at the University of Maryland School of Medicine.After completing her training, Dr. Ullman continued to pursue her passion for education. She has held faculty and leadership roles throughout her career, and currently serves as professor of neurosurgery at the Donald and Barbara Zucker School of Medicine at Hofstra/Northwell. As a core faculty member of Northwell's neurosurgery residency program, she is committed to training the future leaders of brain surgery.Dr. Ullman currently serves on the New York state trauma and advisory committees, and was the first woman to serve as an officer and vice president of the Congress of Neurological Surgeons. She also previously served as chair of the American Association of Neurological Surgeons and the Congress of Neurological Surgeons Section on Neurotrauma and Critical Care. Dr. Ullman has been recognized as one of Castle Connolly's ""Top Doctors"".". Dr. Ullman is rated as a Distinguished provider by MediFind in the treatment of Apoplexy. Her top areas of expertise are Subdural Hematoma, Delirium, Chronic Subdural Hematoma, Craniectomy, and Gastrostomy.

Jason A. Ellis, MD, is a neurosurgeon at Northwell Health's Lenox Hill Hospital. He treats patients with complex cerebrovascular and skull base conditions. He has expertise in the use of microsurgical, neuroendoscopic, and minimally invasive approaches to the brain and spine. Dr. Ellis treats people with conditions including brain and spinal cord tumors, cerebrovascular malformations, brain aneurysm, carotid stenosis, Moyamoya disease, acoustic neuroma (vestibular schwannoma), meningioma, Chiari malformation, trigeminal neuralgia, hemifacial spasm and stroke.Dr. Ellis frequently performs intricate microneurosurgical procedures including cerebral bypass surgery to restore blood flow to the brain after stroke; minimally invasive cerebral endoscopy to treat deep-seated brain lesions; and non-invasive gamma knife radiosurgery. Dr. Ellis has developed special microsurgical techniques using exoscopes to perform complex brain surgery.Dr. Ellis earned his undergraduate degree at Harvard University and his medical degree from Columbia University. As a student with interests in the frontiers of science, technology, and biomedical research, as well as a keen desire to make an immediate health impact in people's lives, it made perfect sense for me to pursue neurosurgery as my life's work, he says.He completed a neurosurgery residency at the Neurological Institute of New York/Columbia University Medical Center and a cerebrovascular neurosurgery fellowship at Emory University Hospital. He will receive his MBA from NYU's Stern School of Business in the spring of 2025.At Lenox Hill, Dr. Ellis works with a multidisciplinary group of specialists including neurologists, neuro-anesthesiologists, pathologists, oncologists, interventional neuroradiologists, head and neck surgeons, radiation oncologists, and neurocritical care providers.Dr. Ellis is an associate professor of neurosurgery at the Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Director of Cerebrovascular and Skull Base Surgery at Lenox Hill Hospital, and Co-Director of the cerebrovascular surgery fellowship at Lenox Hill Hospital. He is also the principal investigator of several clinical trials that seek to improve the surgical care of patients with tumors and vascular conditions of the nervous system.He explains that the most rewarding part of his job is enabling patients to improve their quality of life. My goal is to improve the condition of each patient that I encounter with a neurosurgical problem by offering the highest quality of specialized care possible. Dr. Ellis is rated as a Distinguished provider by MediFind in the treatment of Apoplexy. His top areas of expertise are Apoplexy, Primitive Neuroectodermal Tumor (PNET), Posterior Fossa Tumor, Microvascular Decompression, and Gastrostomy.