This week Eli sits down with Dr Howard Liddle. Dr Liddle is a professor in the Department of Public Health Sciences, and Director of the Center for Treatment Research on Adolescent Drug Abuse at the University of Miami Miller School of Medicine. Dr. Liddle's research focus is on the development, testing, implementation, and dissemination of family-based treatment for adolescent substance abuse and delinquency. The discussion touches on a breadth of topics including his early inspirations working with family therapy and youth, how his ideas developed under mentors like Mnuchin and Haley, and the importance of sponsoring the technique and idea of change in psychotherapy. Finally they discuss the origins of Multi-dimensional Family Therapy, how it pays homage to traditional models, and how it moves the profession forward in terms of empirical support.