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| | Timothy Witham, M.D., FACS, Director
Assistant Professor in Neurosurgery Assistant professor of neurology and director of the Johns Hopkins Bayview Spine Program, Timothy Witham, M.D., FACS, focuses on complex spinal disorders. His interests include the surgical treatment of degenerative conditions at the cervical and lumbar spine to include instrumented fusion and dynamic stabilization procedures. Board-certified by the American Board of Neurological Surgery, Dr. Witham has interests in the treatment of spinal tumors, spinal trauma and complex occipital-cervical junction disorders. Dr. Witham earned a BS with honors at the Pennsylvania State University and a medical degree at The Johns Hopkins University School of Medicine. He completed an internship in general surgery and a residency in neurological surgery at the University of Pittsburgh, as well as advanced training in complex reconstructive spinal surgery and spinal oncology at Johns Hopkins under the direction of Dr. Ziya Gokaslan. He recently completed a military commitment as Chief of the Neurosurgery Element at Keesler Air Force Base in Biloxi, Mississippi. | | | | 
| | Ali Bydon, M.D., Clinical Director
Assistant Professor of Neurosurgery Ali Bydon, M.D., clinical director of the Johns Hopkins Bayview
Spine Program and assistant professor of neurosurgery, specializes in brain and spinal trauma, neurosurgical oncology, and complex spinal restoration and reconstruction. Dr. Bydon earned a medical degree at the University of Michigan School of Medicine in Ann Arbor. He completed residency training in neurological surgery at the Henry Ford Hospital in Detroit where he graduated with distinction. He also completed a fellowship in minimally-invasive spine surgery at Henry Ford as well as a fellowship at Louisiana State University on the surgical treatment of peripheral nerves. Click here to view Dr. Bydon's presentation on "The Management of Low Back Pain (LBP)." | | | |  | | Judy Huang, M.D.
Director, Cerebrovascular Neurosurgery
Assistant Professor of Neurosurgery Assistant professor of neurosurgery and director of cerebro-vascular neurosurgery, Judy Huang, M.D., specializes in the treatment of cerebrovascular disorders such as cerebral aneurysms, carotid artery stenosis and arteriovenous malformations (AVMs). She also focuses on the treatment of spinal disorders, and primary and metastatic brain tumors. Dr. Huang earned a medical degree at the Columbia University College of Physicians and Surgeons in New York. There, she also completed residency training in neurological surgery and pursued a fellowship in neurovascular research. Active in neurological research, Dr. Huang's research focuses on the inflammatory mechanisms of stroke, as well as intracerebral hemorrage and aneurysmal subarachnoid hemorrage. She is further investigating gender differences in stroke and other cerebro-vascular diseases. Dr. Huang has published extensively on experimental studies of stroke and carotid endarterectomy, including a widely used handbook of operative neurosurgery. Dr. Huang has received a number of awards, including the Young Clinician Investigator Award from the Neurosurgery Research and Education Foundation of the American Association of Neurological Surgeons, and the School of Medicine Clinician Scientist Award. She has received several teaching awards and serves as Co-Director of the Neurosurgery Residency Training Program as well as the Director of Medical Student Education. | | | |  | | Alessandro Olivi, M.D.
Director, Neurosurgical Oncology
Professor of Neurosurgery Alessandro Olivi, M.D., professor of neurology and director of neurosurgical oncology, focuses on the surgical treatment of primary and metastatic tumors of the brain and spinal cord. He performs microsurgery on skull-based tumors, such as acoustic neuromas, meningiomas and vascular lesions. Dr. Olivi also holds clinical intrests in cerebrovascular conditions and craniofacial reconstructions. Actively involved in designing and running clinical experimental protocols, Dr. Olivi has worked to develop and assess new treatments for patients with brain tumors. He also leads multi-
disciplinary initiatives to coordinate the most ideal management of patients with newly diagnosed or recurrent brain tumors. Dr. Olivi is involved in several research activities in the areas of immuno-therapy for brain tumors, cancer stem cells and new drug delivery systems. | | | |  | | Jean-Paul Wolinsky, M.D.
Clinical Director, Johns Hopkins Spine Program
Assistant Professor of Neurosurgery Jean-Paul Wolinsky, M.D., assistant professor of neurosurgery and clinical director of the Johns Hopkins Spine Program, cares for patients with any neurosurgical problem. His primary neuro-surgical interests lie in neurosurgical oncology, pathology of the occipital-cervical junction and complex spinal reconstruction. He has been actively developing new approaches to spinal surgery and concepts for spinal reconstruction. Dr. Wolinsky earned a medical degree from Baylor College of Medicine in Houston, where he subsequently completed neurosurgery training. In addition to general neurosurgical training, he gained extensive trauma experience at Ben Taub Hospital, one of the world’s largest trauma hospitals. He also received specialized training in neurosurgical oncology at M.D. Anderson Cancer Hospital during his residency. After the neurosurgical residency, he completed an AO Spine fellowship in complex reconstructive spine surgery and spinal oncology at The Johns Hopkins Hospital. | | | |  | | Richard Zorowitz, M.D.
Chief, Physical Medicine and Rehabilitation
Associate Professor of Medicine | | | | 
| | John Chi, M.D.
Instructor of Neurosurgery | | | | 
| | Patrick C. Hsieh, M.D.
Instructor of Neurosurgery Instructor of neurosurgery, Patrick C. Hsieh, M.D., provides care to patients with all neurosurgical problems. His primary clinical interests include neuro-oncology, spinal oncology, spinal deformity surgery, complex spinal reconstructive surgery and minimally-invasive spine surgeries such as disc arthroplasty and other motion-preservation procedures. Dr. Hsieh's research focuses on outcome studies of spinal oncology surgery, spinal deformity surgery and minimally-invasive spinal procedures. He also has pursued research on biomechanical studies and the application of osteobiologics and nanoparticles for spinal reconstruction. After earning a medical degree at the University of Southern California Keck School of Medicine in Los Angeles, Dr. Hsieh completed an internship and residency in neurosurgery at Northwestern University McGaw Medical Center in Chicago. While there, he also completed specialized training in spinal deformity surgery and advanced minimally-invasive spinal surgery during a fellowship in complex reconstructive spinal surgery under the Stephen Ondra, M.D. and John C. Liu, M.D. | | | | 
| | Jared Abay, MPA-C, PA-C Jared Abay, MPA-C, PA-C, is a senior physician assistant in the department of neurosurgery at Johns Hopkins Bayview. Abay earned an undergraduate degree at George Washington University and a master's at the University of Nebraska. Abay also completed a physician assistant surgical residency program at Sinai Hospital. | | | |  | | Carla Chance, PA-C, MS Carla Chance, PA-C, MS, physician assistant in the department of neurosurgery at the Johns Hopkins Bayview Medical Center. After earning a bachelor of science degree in behavioral neuroscience from Lehigh Univeristy, Chance completed physician assistant training at Arcadia University, where she graduated with a master's of medical science degree in physician assistant studies. | | | |  | | Jian Wu, PA-C, MS Jian Wu, PA-C, MS, is a physician assistant in the department of neurosurgery at the Johns Hopkins Bayview Medical Center. Wu completed medical training at Shanndong Medical University in China, and physician assistant training at Union College in Nebraska. Wu's clinical interests include neurosurgery. |
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