Thomas McLellan (Psychologist)

Thomas McLellan is an American psychologist best known for his work in addiction research and treatment. He co-founded the Treatment Research Institute and developed influential assessment tools like the Addiction Severity Index, which helps evaluate substance abuse problems. McLellan's research emphasizes the importance of evidence-based treatment strategies and addressing the broader social factors influencing addiction. His work has significantly impacted how addiction is understood and treated, advocating for a more integrated approach that includes mental health, social support, and medical care in recovery processes.