Christopher Layne is associate professor of Psychology at Nova Southeastern University, where he directs a clinical psychology training clinic specializing in childhood traumatic stress and bereavement. He contributed to prolonged grief disorder in the DSM-5-TR and co-authored the manualized interventions Psychological First Aid, FOCUS for Military Families, Skills for Psychological Recovery, Trauma and Grief Component Therapy for Adolescents, and Multidimensional Grief Therapy. Layne is lead developer of multidimensional grief theory and of assessment measures of bereavement, grief, war-related trauma and adversities, and social support. He leads the National Child Trauma Workforce Institute, a National Child Traumatic Stress Network Center that adapts and disseminates the Core Curriculum on Childhood Trauma to promote competency-based education in childhood traumatic stress and bereavement. His professional interests include intervention, evidence-based practice, evidence-based assessment, professional education, research methods, theory-building, resilience, health/positive psychology, and developmental psychopathology, and applying these approaches to traumatic stress and bereavement.