Below comes from a page at Johns Hopkins:
DONLIN M. LONG served as director of the Department of Neurosurgery from 1973 through 2000, when he stepped down to devote all his time to research, education, and patient care. He holds a joint appointment at the Applied Physics Laboratory and is a founder of the Laboratory for Technology Transfer.
Dr. Long, who also holds a Ph.D. in neuroanatomy, focuses his treatment and research on tumors of the skull, complex spinal problems, and problems of chronic pain. As director, he led his department to become one of the best of its kind, responsible for major contributions to the understanding of brain systems, brain tumor therapy, and pain treatment. Twenty-three of his trainees have gone on to head neurosurgery departments or divisions in hospitals and medical schools all over the world. In 2001, Dr. Long was appointed a Distinguished Service Professor.