Kirk D. Strosahl, PhD, is cofounder of acceptance and commitment therapy (ACT), a cognitive behavioral approach that has gained widespread adoption in the mental health and substance-abuse communities. He is coauthor of Brief Interventions for Radical Change and In This Moment. Strosahl provides training and consultation services for Mountainview Consulting Group, Inc. He is a pioneer in the movement to bring behavioral health services into primary care. He resides in Portland, OR.