Ben Sedley, PhD, is a clinical psychologist and acceptance and commitment therapy (ACT) practitioner with over 15 years of experience working with children, adolescents, adults, and families facing mental health difficulties. Sedley's research and practice has focused on examining children and young people's understanding of mental health, which has helped guide him on the best ways to explain mental health concepts and ACT to young people. He is the author of the bestselling teen self-help book, Stuff That Sucks.