In 1964 Dr. Mark went on the part-time staff of the Massachusetts General Hospital. He became the Director of Neurosurgery at the Boston City Hospital which position he held until 1986. He and Dr. William Sweet and Dr. Frank Ervin implanted electrodes in the amygdala and hippocampus of patients with intractable temporal lobe epilepsy and aggressive behavior, with Dr. Jose Delgado.
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1972). Violence and the Brain. Harvard Law Review. (