Ronald M. Rapee, PhD, is distinguished professor in the school of psychological sciences at Macquarie University in Sydney, Australia; and director of the Centre for Emotional Health. He has been involved in an advisory capacity with the DSM-IV and DSM-5, and has sat on both public and scientific advisory committees for national and international organizations. He is developer of Cool Kids, a scientifically proven treatment program for anxious young people that is used by health departments, therapists, and organizations in over thirty countries. Ann Wignall, DPsych, was principal clinical psychologist at Northern Sydney Health, and service manager for child and youth mental health. She established the Child & Adolescent Anxiety Clinic at Royal North Shore Hospital in 1995, and ran national training programs for treatment and early intervention in anxiety and depression. Susan H. Spence, PhD, is a clinical psychologist and researcher specializing in the assessment, treatment, and prevention of child and adolescent anxiety and depression. She is an emeritus professor at Griffith University, Queensland, Australia; and has a strong international reputation, having received several significant awards for her contribution to youth mental health. Heidi Lyneham, PhD, is a clinical psychologist and researcher who focuses on assessment and treatment of emotional difficulties in children and families, particularly in improving access to services. She is clinic director at the Centre for Emotional Health at Macquarie University, Sydney, Australia. Vanessa Cobham, PhD, is a clinical psychologist specializing in the treatment of anxiety and post-traumatic stress in children and adolescents. She is a professor at The University of Queensland, and an advanced clinical psychologist within Children's Health Queensland's Child and Youth Mental Health Service. She is from Brisbane, Australia.