Sheri L. Turrell, PhD, is a clinical psychologist living with her family in Toronto, ON, Canada. She is passionate about her clinical work with adolescents, helping them move toward a life that matters. Turrell is primary investigator, working in collaboration with Mary Bell, for studies of group-based acceptance and commitment therapy (ACT), and is developing a mobile ACT app for adolescents. She runs a full-time private practice, and enjoys being a consultant and trainer for graduate students and mental health professionals who are interested in learning ACT. Turrell teaches ACT at the university level, where she also facilitates therapy groups.Mary Bell, MSW, RSW, is a social worker in Toronto, ON, Canada. Currently affiliated with The Hospital for Sick Children in Toronto, Bell has had a private practice in Toronto and Singapore. Collaborating with Sheri Turrell, she continues to evolve an acceptance and commitment therapy (ACT) approach to working with adolescents and their families, and is developing an ACT app for adolescents. She loves to share ACT with clients and other practitioners. Foreword writer Kelly G. Wilson, PhD, is professor of psychology at the University of Mississippi. He is a central figure in acceptance and commitment therapy (ACT), and coauthor of the landmark Acceptance and Commitment Therapy. Wilson is among the most sought-after ACT trainers. His popular experiential workshops touch thousands of clinicians and students each year. Find out more at www.onelifellc.com.