Dr. Barrett is a full clinical professor in the International Disaster Psychology Program in the Graduate School of Professional Psychology (GSPP) at the University of Denver. He has taught program evaluation in the doctoral program in GSPP since 1980. Previously, he was senior medical officer and consultant for the Mental Health and Substance Abuse Department in the World Health Organization. Between 1994 and 2004 he was the mental health director for the state of Colorado. He is also past president of the National Association of State Mental Health Directors.