He was educated at Colgate University, Bryn Mawn College, and Oxford University. He has published more than 300 articles and chapters on addiction research. Dr. McLellan and his colleagues have been developing and evaluating treatments for alcohol and drug dependence, as well as evaluation instruments such as the Addiction Severity Index and the Treatment Services Review. They are currently pursuing such questions as “What are the active and inactive ingredients of treatment?” and “What is the appropriate duration and content of treatment for various types of patients?”