Ellert R.S. Nijenhuis, Ph.D., is a psychologist, researcher, and former psychotherapist. He engaged in the diagnosis, treatment and study of severely traumatized patients for more than four decades and teaches and writes extensively on the themes of trauma-related dissociation and dissociative disorders. He initiated several biopsychological studies of complex dissociative disorders. His publications (see www.enijenhuis.nl) include the book Somatoform Dissociation. With Onno van der Hart and Kathy Steele he co-authored the book The Haunted Self: Structural Dissociation and the Treatment of Chronic Traumatization. A trilogy is The Trinity of Trauma: Ignorance, Fragility, and Control. With his daughter Kirande, he runs an eAcademy on trauma and dissociation. Nijenhuis has been one of the founders of the ESTD. The International Society for the Study of Trauma and Dissociation granted him several awards, including the Lifetime Achievement Award.