Gary A. Zarkin is a distinguished fellow in Behavioral Health Economics at RTI International. He has led or participated in many projects involving the economic analysis of drug treatment, prevention, and studies of workplace substance abuse. Dr. Zarkin has published extensively on the cost, cost-effectiveness, and the benefit-cost of substance abuse interventions. He currently leads the Analytical Support Contract for the Substance Abuse and Mental Health Services Administration (SAMHSA) and is estimating the cost and cost-effectiveness of interventions on several projects funded by the National Institute on Drug Abuse. He previously led the development of a method to estimate the cost of services (the Substance Abuse Services Cost Analysis Program [SASCAP]) for methadone treatment, a therapy for opioid dependence. Before coming to RTI, Zarkin was an assistant professor of economics at Duke University and a research associate professor at Duke University’s Institute of Statistics and Decision Sciences. He has published on economics, substance abuse, and health service topics in a wide range of professional journals.