ABSTRACT
Dr. A. Thomas McLellan is a distinguished clinical researcher noted for his achievements and impact in the field of addiction studies. He worked to bring reforms to drug and alcohol addiction treatment, including identifying substance use disorder as a chronic health condition instead of a moral lapse, and improving access to and quality of evidence-based treatment for people with chronic addiction. He is credited for being the principal developer of the Addiction Severity Index (ASI) and the Treatment Services Review (TSR). This profile highlights his professional achievements and presents a citation analysis, including publication and citation patterns.