Black, Tamar D.: - Tamar D. Black, PhD, is an educational and developmental psychologist in Melbourne, Victoria, Australia. She is a school psychologist, and runs a private practice working with children, adolescents, young adults, and parents. She has extensive experience providing clinical supervision to early-career and highly experienced psychologists. She also provides training in acceptance and commitment therapy (ACT) to clinicians and teachers in using ACT with children and adolescents, and using ACT in schools.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.