Dr. Walker’s expertise is in the fields of addictive behaviors, cannabis treatment and misuse, and intimate-partner violence. Her research focuses on the development, testing and implementation of interventions that bring about positive changes in patterns of behavior. In particular, Dr. Walker examines how to help people gain motivation to change risky behaviors and identifies the best ways to assist them in achieving their goals. She received her MS and PhD in clinical psychology from the University of New Mexico and is a Licensed Clinical Psychologist.

Professor Roger Roffman's research interests focus on behavioral interventions in the fields of addictive disorders and domestic violence. His studies of check-up interventions are tailored for individuals who have concerns about current behaviors that are causing adverse effects, but are ambivalent about committing to change. His studies of behavioral counseling interventions focus on supporting individuals who desire to change their behaviors.