Brigham and Women’s Hospital announced Thursday that it has appointed a new chairman of neurosurgery. Dr. E. Antonio Chiocca will lead the neurosurgery department at both the Brigham and Faulkner Hospital, beginning August 1. He has been chair of neurological surgery at Ohio State University Wexner Medical Center since 2004, but he trained in Boston, completing his residency in neurosurgery at Massachusetts General Hospital.