Neuroscience Team

Expert Neurologists and Neurosurgeons

When seconds count, you want the best team of qualified experts at your disposal. Learn more about the neurologists and neurosurgeons at the Vickie and Jack Farber Institute for Neuroscience at Jefferson New Jersey.

Taimur Zaman, MD

Chief of the Vickie and Jack Farber Institute for Neuroscience at Jefferson New Jersey Taimur Zaman, M.D., completed his neurology residency at New York University Medical Center and has more than 20 years of experience practicing neurology at teaching hospitals in New Jersey. He has a special interest in cerebrovascular disease, demyelinating disease and degenerative neurological disorders. A former director of neurology at Newark Beth Israel Medical Center, Dr. Zaman is a member of the American Academy of Neurology.

David A. Roshal, DO

Medical Director of Stroke Services David Roshal, D.O., D.ABPN, is a board-certified and published neurologist with subspecialty certification in clinical neurophysiology from the American Board of Psychiatry and Neurology (ABPN). Dr. Roshal specializes in hospital-based neurology and clinical neurophysiology at Jefferson Health in New Jersey. He also serves as a clinical assistant professor in the Department of Medicine/Neurology at Rowan University School of Osteopathic Medicine. Dr. Roshal completed his neurological training at Thomas Jefferson University Hospital, and completed a one-year subspecialty fellowship in clinical neurophysiology at Hahnemann University Hospital/Drexel University College of Medicine. He has a special interest in stroke, neuromuscular diseases, and neuroelectrodiagnostics (e.g., EEG).

Jack Jallo, M.D.

Jack Jallo, MD, PhD, FACS, is Professor and Vice Chair for Academic Services and Director of the Neurotrauma Critical Care Program at Thomas Jefferson University’s Department of Neurological Surgery. A graduate of the medical school at the George Washington University, he went on to Temple University to complete an internship in general surgery, a residency in neuro-surgery, and a fellowship in neurotrauma/critical care, as well as a PhD in physiology. A prolific writer and lecturer on the topics of traumatic brain injury, closed head injuries, spinal cord injuries, and surgical guidelines and techniques, among many other specialized topics, Dr. Jallo is a fellow of the American College of Surgeons and the Royal Society of Medicine.

Jay Klazmer, DO, DABPN

Jay Klazmer, D.O., DABPN, is a board-certified neurologist with a subspecialty certification in vascular neurology. He has been in clinical practice for nearly 30 years, caring for adults and children over the age of five for many neurological conditions, including headaches, dizziness, epilepsy, memory disorders, Alzheimer’s disease, Parkinson’s disease, Attention Deficit Disorder (ADD) with and without hyperactivity, electro-diagnostic for Carpal Tunnel Syndrome, Peripheral Neuropathy and Cervical/Lumbar Radiculopathy.

Anca S. Popescu, MD, FAAN

Anca S. Popescu, M.D., is board-certified in psychiatry and neurology, with specialty certification in pain medicine and vascular neurology. In addition, she holds certification in headache medicine through the United Council of Neurological Subspecialties along with a board certification from the American Board of Psychiatry and Neurology, subspecialty in epilepsy. She completed her residency at Drexel College of Medicine in Philadelphia, PA. Previously an assistant professor at Temple University and UMDNJ, Dr. Popescu has extensive post-graduate training that includes a clinical pain fellowship at Massachusetts General Hospital and Harvard Medical School, as well as a clinical neurophysiology fellowship at Philadelphia’s Thomas Jefferson University Hospital. She has a special interest in the treatment of neuropathic pain, cancer pain, neurological complications of systemic diseases, epilepsy, Parkinson's and dementia. She was awarded a certificate of appreciation in recognition of her contribution to ambulatory medical care and public health by the Center of Disease Control and Prevention.

Or Shachar, MD

Dr. Or Shachar is a board certified neurologist. A graduate of Boston University School of Medicine, he underwent fellowship-training in clinical neurophysiology at Allegheny University Hospitals in Philadelphia, and completed his residency in neurology at Thomas Jefferson University Hospital there. Board Certified by the American Board of Psychiatry and Neurology and the American Board of Electrodiagnostic Medicine, Dr. Shachar completed his internship in Internal Medicine at New York University and Bellevue Hospital Center (New York City). He is a member of the American Academy of Neurology, the American Association of Neuromuscular and Electrodiagnostic Medicine (AANEM), and the Pennsylvania Medical Society.

Dahlia J. Irby, MD

After earning her medical degree from Hahnemann University School of Medicine, Dr. Dahlia J. Irby completed her internal medicine internship at Lankenau Hospital in Wynnewood, PA. She completed her residency in neurology at Hahnemann University Hospital in Philadelphia, PA, where she also completed her clinical neurophysiology fellowship in 2002. Dr. Irby has been practicing general neurology in private practice since 2002, most recently with her own practice, Comprehensive Neurology Services. In addition to practicing general neurology in the private practice setting, Dr. Irby also holds faculty appointments in hospitals throughout South Jersey, including Jefferson Washington Township Hospital and Inspira in Vineland. Dr. Irby has contributed research in the area of Alzheimer’s disease to publications including the American Journal of Alzheimer’s Disease and Other Dementias. While in private practice, Dr. Irby was also involved in performing clinical trials utilizing Botox for migraines.

Eddy Garrido, M.D.

Eddy Garrido, MD, FACS, is an Associate Professor of Neurosurgery at Thomas Jefferson University Medical School. Specializing in cerebrovascular and interventional neurosurgery, Dr. Garrido completed medical school in his native Dominican Republic in 1969, and his neurosurgery residency at Boston’s Tufts University (1971-75). In 1999, Dr. Garrido became one of the first neurosurgeons in the region to use Gamma Knife® technology to target and treat brain tumors and related conditions. A fellow of the American College of Surgeons and Fellowship trained in Pediatric Neurosurgery, Dr. Garrido is member of the American Association of Neurological Surgeons, the Mid-Atlantic Neurological Society and the Congress of Neurological Surgeons, among other professional affiliations. Dr. Garrido was Chief of Neurosurgery for many years at Lancaster General Hospital in Pennsylvania prior to joining Jefferson Health in New Jersey. 

Robert H. Rosenwasser, M.D.

Robert H. Rosenwasser, MD, FACS, FAHA, is The Jewell L. Osterholm, MD, Professor and Chairman of the Thomas Jefferson University Department of Neurological Surgery. Dr. Rosenwasser is world renowned for his surgical expertise in preventing and treating life-threatening brain aneurysms. A member of the American Association of Neurological Surgeons, Congress of Neurological Surgeons, the American Academy of Neurological Surgery and the American College of Surgeons, Dr. Rosenwasser is heavily involved in research and has published more than 300 peer-reviewed publications, abstracts and book chapters. Dr. Rosenwasser provides treatment for all types of neurovascular conditions, using both open surgical and endovascular techniques.

Megdad Zaatreh, M.D.

Megdad Zaatreh, MD, is a neurologist with special expertise in Epilepsy. He graduated medical school from Jordan University in Amman. He completed a residency in neurology at the University of North Carolina at Chapel Hill, NC, where he served as Chief Resident of Neurology. In 2000, Dr. Zaatreh moved to New Haven, CT, to join the elite Epilepsy Program at Yale University, where he completed a two-year fellowship in Epilepsy and Epilepsy Surgery Evaluation. Dr. Zaatreh is board certified in neurology and the subspecialty of Epilepsy by the American Board of Psychiatry and Neurology. After completing his fellowship, Dr. Zaatreh was recruited by the University of North Carolina to develop an Epilepsy Surgery Program. During his academic career, he served as assistant professor of Neurology and Medical Director of the Epilepsy Surgery Center at the University of North Carolina for three years, before moving to New Jersey. Dr. Zaatreh has published multiple research articles in peer-reviewed medical journals, including the New England Journal of Medicine.

Hekmat Zarzour, MD

Hekmat Zarzour, MD, is a graduate of Voronezh State Medical Academy in Voronezh, Russia. Dr. Zarzour has completed many post-graduate training programs, including a residency in neurosurgery at the Burdenko Institute in Moscow, Russia (1999-2006), a clinical research fellowship in Skull Base/Radiosurgery at Ohio State University Hospital in Columbus, OH; a fellowship in Endovascular Neurosurgery at Harvard Medical School’s Brigham and Women’s Hospital in Boston, MA; a residency in Neurosurgery – where he was Chief Resident – at St. Louis University Hospital in Saint Louis, MO; a fellowship in Vascular/Skull Base Neurosurgery also at St. Louis University Hospital; and a residency in Neurosurgery at Mount Sinai Hospital’s Icahn Medical School in New York). Fluent in English, Russian and Arabic, Dr. Zarzour is a member of the American Association of Neurological Surgeons, the Congress of Neurological Surgeons, and the Society of Neuro Interventional Surgery. His areas of special interest include cerebrovascular and endovascular disease, including aneurysms, AVMs, and carotid stenosis; general neurosurgery, including tumors of the skull-base, pituitary, brain, spinal and peripheral nerves; trigeminal neuralgia, minimally invasive spine surgery and spinal fusions, hydrocephalus, epilepsy and peripheral nerve disease.

Richard F. Schmidt, MD

Richard F. Schmidt, MD, is a Clinical Assistant Professor in the Department of Neurosurgery. He earned his Bachelor of Arts degree in Bioethics from the University of Pennsylvania and his medical degree from the University of Medicine and Dentistry of New Jersey, New Jersey Medical School in Newark, NJ (UMDNJ). He then completed his residency in neurological surgery with an enfolded fellowship in Cerebrovascular Neurosurgery at Thomas Jefferson University Hospitals in Philadelphia, PA.

Dr. Schmidt has conducted research on a variety of topics, including epilepsy surgery, management of spinal cord injury, complex spinal tumor surgery, and modulation of the blood-brain barrier through sphenopalatine ganglion stimulation in rat models.  Most recently, he has been investigating the use of novel techniques and devices for endovascular interventions at the Department of Neurological Surgery, Vickie and Jack Farber Institute for Neuroscience, Thomas Jefferson University, Philadelphia, PA.

Christian M. Hoelscher, MD

Christian M. Hoelscher, MD, is a Clinical Assistant Professor in the Department of Neurosurgery. A graduate of the Pennsylvania State University and New York University School of Medicine in New York, NY, he went on to complete his residency in neurological surgery at Thomas Jefferson University Hospitals in Philadelphia, PA. Dr. Hoelscher also completed enfolded fellowships in both stereotactic and functional neurosurgery, as well as spine surgery.

Dr. Hoelscher conducted research on several topics, including epilepsy, spinal disorders, and neuromodulation for neuropathic pain while at the Department of Neurological Surgery, Vickie and Jack Farber Institute for Neuroscience, Thomas Jefferson University, Philadelphia, PA.