Dr. John Ratliff is Professor and Vice Chair of Neurosurgery, Departmental Quality Officer, and Co-Director of the Spine and Peripheral Nerve Surgery Division. As a spine surgeon, he treats a diverse array of degenerative spinal conditions. He has a specific research emphasis on quality improvement, decreasing complications in spine surgery, and improving surgical treatment of intramedullary spinal cord tumors.

Dr. Ratliff has served on the Executive Committee of the Congress of Neurological Surgeons and the Joint Section of Disorders of Spine and Peripheral Nerves, is Treasurer for the Council of State Neurosurgical Societies, and is on the Board of Directors of Neuropoint Alliance. He is immediate past-chairman of the joint AANS/CNS Neurosurgery Quality Council.

Dr. Schirmer earned his medical degree and a doctorate in medical research from Ludwig-Maximilians University in Munich, Germany and at Harvard Medical School under the auspices of the Harvard Munich Alliance for Medical Education. He then completed his residency in neurosurgery and fellowship in interventional neuroradiology at the Tufts Medical Center program in Boston. ABNS board certified in neurological surgery and holding CAST certificates both in neuroendovascular surgery and neurocritical care, he currently serves as vice chair in the department of neurosurgery and is professor of neurosurgery and neuroscience in the unmodified research track at the Geisinger Commonwealth School of Medicine. Dr. Schirmer also serves as the system director of the Geisinger Comprehensive Stroke Centers and System Director of Cerebrovascular and Endovascular Neurosurgery, specializing in the treatment of stroke and related vascular disorders of the brain and spine using surgery, endovascular and radiation modalities. He is the program director of the Geisinger Neurosurgery residency training program and the CAST Neuroendovascular Fellowship program.

His research interests focus on the quality metrics, variation of care, shared decision making and patient centered outcomes, genomics and biomarkers of stroke, machine learning and data analytics. He serves as principal investigator of several clinical trials in the stroke arena aiming to bringing novel and innovative therapies to the market and creating premier Geisinger initiatives.

He serves as chair-elect of the AANS/CNS Cerebrovascular Section and the executive committee of the Congress of Neurological Surgeons where he is co-chair of the International Division and on the board of the CNS foundation, chair of the public relations and communications subcommittee of the AANS/CNS Washington Committee and Advisor to the AMA RBRVS RUC Committee. He has been appointed to MEDCAC and appointed to the Premier Group Purchasing Organization Member Cardiovascular Advisory Committee and multiple CMS/Acumen Cost- and Medicare Spending per Beneficiary- Measure Development Panels.

Dr. Wang specializes in the treatment of complex spinal disorders. He graduated Phi Beta Kappa from Stanford University with an undergraduate degree in Microbiology and Immunology and then received his medical degree from the Stanford University School of Medicine. Dr. Wang completed his residency training in Neurological Surgery at the University of Southern California, and following his residency, he served as a fellow in spinal cord and spinal column surgery at the University of Miami Center for Complex Spine Surgery. Dr. Wang has been a prolific researcher and has published over one hundred peer reviewed papers, book chapters, abstracts, and oral presentations. He has received both the distinguished Sanford Larson and Frank Mayfield Research Awards from the Joint Spine Section of the American Association of Neurological Surgeons and Congress of Neurological Surgeons. His research areas include the use of robotics in spinal surgery, resorbable spinal implants, the treatment of cervical myelopathy, and the development of new osteobiologic agents to promote spinal fusion. He has innovated minimally invasive spine surgery techniques and, in particular, has been involved in the investigation and development of outcomes assessments in spinal surgery. Dr. Wang is Board Certified in Neurological Surgery and his specialty interests include minimally invasive spine surgery, spinal cord tumors, total disc replacement, spinal reconstruction, syringomyelia, spinal cord injury, and surgery for neuropathic pain.