Leonardo Rangel-Castilla, MD, is a cerebrovascular and endovascular neurosurgeon. He completed his neurosurgery residency at Methodist Neurological Institute in Houston, TX. He pursued additional fellowship training in cerebrovascular and skull base at the Barrow Neurological Institute and neuroendovascular surgery at the University of Buffalo, Buffalo, NY. Currently he is an assistant professor at the Mayo Clinic, Rochester, MN. Dr. Rangel-Castilla has published more than 100 articles and has co-edited the neurosurgical textbook Neuroendoscopic Surgery.