Dr. George De Leon, a pioneering figure in psychology and addiction treatment, passed away on September 28, 2026, at the age of 91. Renowned internationally for his groundbreaking work in the field of substance abuse disorders, Dr. De Leon dedicated his career to advancing understanding of how individuals change and recover from addiction.

As a highly respected researcher, educator, and museum professional, Dr. De Leon played a key role in establishing therapeutic communities as a validated and effective approach to addiction recovery. His extensive research contributed significantly to evidence-based treatment models that continue to influence clinical practice worldwide.

His seminal publication, *The Therapeutic Community: Theory, Model and Method*, is widely regarded as one of the most significant texts on addiction treatment. The book provided a comprehensive framework that brought scientific credibility to therapeutic approaches and shaped the field for decades.

In addition to his academic and clinical contributions, Dr. De Leon combined his professional work with personal interests, notably creating the Jazz Not Junk program. This initiative featured late-afternoon musical sessions inspired by New York City jazz from the 1920s, held at the Barnum House. The gatherings fostered community engagement and reflected his belief in the therapeutic power of creativity and shared experiences.

Dr. De Leon is survived by his wife Nancy Janician, to whom he was married for 43 years, their son Joshua, his daughter-in-law Giovanni, and two grandchildren, Ariel and Alexa. His legacy endures in the ongoing development of addiction treatment and the many lives influenced by his work.