Louis Chang, MD

Dr. Tae Hwan Chung is an assistant professor of physical medicine and rehabilitation and neurology at Johns Hopkins. His areas of training and expertise include neuromuscular disorders and physical medicine and rehabilitation.Thanks to his diverse background, Dr. Chung is uniquely positioned to diagnose and treat a variety of neuromuscular conditions and pathology by using electrodiagnostic procedures and immune and rehabilitative treatments. Dr. Chung is particularly interested in rehabilitative treatments and therapeutic exercise for various neuromuscular diseases, such as myositis, peripheral neuropathy and motor neuron diseases.Dr. Chung runs a multidisciplinary rehabilitation clinic with the Johns Hopkins neuromuscular rehabilitation team, which he helped develop with physical, occupational and speech therapists, who are dedicated to helping patients with rare neuromuscular diseases. Note for patients: If you were scheduled with Dr. Chung through the Myositis Center, please use this contact number: (410) 550-6962.If you've been referred to Dr. Chung to address postural orthostatic tachycardia syndrome (POTS), please note that his POTS clinic is in Lutherville at the Green Spring Station.If you would like to make a contribution using a credit card to support the Neuromuscular and Myositis Rehabilitation Program, please visit our secure online giving page by clicking here.

Risheng Xu, M.D., Ph.D., is a fellowship-trained neurosurgeon with expertise in cerebrovascular and endovascular neurosurgery, and skull base pathologies. He treats patients with a wide range of cerebrovascular disorders such as cerebral aneurysms, subarachnoid hemorrhage, arteriovenous malformations, arteriovenous fistulas, carotid stenosis, cavernous malformations and moyamoya disease. He also treats skull base tumors such as acoustic neuromas (vestibular schwannomas) and meningiomas, and pain disorders such as trigeminal neuralgia.Dr. Xu completed his undergraduate studies at Harvard College, and attended medical school at the Johns Hopkins University School of Medicine, where he also obtained a Ph.D. in pharmacology and molecular sciences. He continued his residency training in neurosurgery at Johns Hopkins, and remained there to complete a fellowship in cerebrovascular and endovascular neurosurgery. Dr. Xu has been active in research throughout his training and has authored and co-authored numerous published studies. His basic science research endeavors focus on neuroinflammation after ischemic stroke and molecular mechanisms underlying trigeminal neuralgia. He has authored or co-authored over 100 manuscripts, and has published in journals such as Nature, Nature Communications, Science Advances, Science Signaling, Neuron, the Proceedings of the National Academy of Sciences (PNAS), the Journal of Neurosurgery, Neurosurgery and other journals. Clinically, he studies the long-term outcomes of patients with cerebrovascular disorders and trigeminal neuralgia.

Abdullah AlQahtani specializes in inherited and noninherited neuromuscular neurological diseases. Dr. AlQahtani obtained his medical degree from the King Saud University in Saudi Arabia. He also completed an internship and earned a master’s degree in public health from the University of Miami Miller School of Medicine, and he obtained residency training in neurology at the University Hospitals of Cleveland-Case Western Reserve University and the Louis Stokes Cleveland Department of Veterans Affairs Medical Center. After completing a neuromuscular fellowship at Case Western Reserve University, Dr. AlQahtani joined the neurogenetics branch of the National Institute of Neurological Disorders and Stroke. He worked on natural history studies of disease progression and phenotype-genotype correlation. His research focuses on the identification of biomarkers of disease progression in neuromuscular diseases.