Mark D. Johnson, MD is a fourth-year neurosurgery resident at the University of Cincinnati. His clinical interest is in cerebrovascular neurosurgery. While in residency he has contributed to the scientific literature on a diverse array of topics including penetrating cranial injuries, traumatic brain injury, spinal neurotrauma, stroke management, glioma treatment, arteriovenous malformation management, neuroendovascular technique, and the history of neurosurgery.