Karekla, Maria: - Maria Karekla, PhD, is a licensed clinical psychologist, and associate professor at the University of Cyprus where she heads the ACThealthy Clinical Psychology and Behavioral Medicine laboratory. She is a peer-reviewed acceptance and commitment therapy (ACT) therapy trainer, and presently serves as the president-elect of the Association for Contextual Behavioral Science (ACBS) where she has been a fellow since 2019. She is also a fellow of the Society of Behavioral Medicine (SBM). She was nominated in 2017 for the National Literary Awards in the children/adolescents category, and also for her illustrations for the book. She has received numerous national and international awards and grants for her research work. In 2018, she was nominated as Cyprus Woman of the Year in the academic/researcher category.Megan M. Kelly, PhD, is a licensed clinical psychologist, and associate professor in the department of psychiatry at the University of Massachusetts Medical School. She has been involved in addictions research for the past sixteen years, with a particular focus on the development of behavioral interventions for individuals with comorbid addictions and mental health disorders. She has received several VA- and NIH-funded awards to develop and evaluate new behavioral interventions and programs for individuals with co-occurring disorders using ACT principles. She has evaluated, treated, or supervised the treatment of over 2,000 people struggling with addictions.Russ Harris is an internationally acclaimed acceptance and commitment therapy (ACT) trainer, and author of the best-selling ACT-based self-help book, The Happiness Trap, which has sold more than one million copies and been published in thirty languages. He is widely renowned for his ability to teach ACT in a way that is simple, clear, and fun-yet extremely practical.