Book excerpt: This book expands on the idea of transformation after trauma through the concept of Resonance. Resonance is presented as the key to posttraumatic growth and transformation and provides practical guidance for accessing it. Resonance is defined as a moment of awakening, through personal stories, that creates an opportunity for transformational learning. This book presents an integrative, holistic and narrative development understanding to individual, organizational and social systems change and transformation after trauma. It proposes a Trauma-Informed Narrative Development Pathway for consideration at all levels of systems and institutions who support people post-trauma. Resonance is critical, timely, and relevant now more than ever. As we continue to work for a world of social justice where preventable sufferings are no longer normalized, a posttraumatic transformation lens allows us to take a developmental perspective to supporting ourselves and those among us touched by trauma to achieve transformational outcomes. In a world with ongoing suffering, the ability to return to core identity memories and access greater connection and love for humanity unleashes the desire to take actions to create a better world for all.