Dr. Lyons joined the clinical faculty in 1986. He has a 1982 PhD in clinical psychology from the University of Louisville. His clinical internship was completed at Yale University and he completed a post-doctoral fellowship in psychiatric epidemiology at Columbia University. His general interests are in psychiatric epidemiology and behavioral and psychiatric genetics. His research focuses on genetic influences on psychopathology, substance abuse, and aging. He is currently principal investigator on the Vietnam Era Twin Study of Aging (VETSA) supported by a grant from NIA. In this study, twins who served in the military during the Vietnam War are administered a comprehensive protocol that includes MRI, sensory functioning, relevant biomedical characteristics, psychosocial functioning, neuro-endocrine status, and genotyping; the primary emphasis of the study is on cognitive functioning (including the re-administration of a measure of general cognitive ability that was administered at the time these men entered the military 30 to 40 years ago).