Onno van der Hart stands as one of the most consequential figures in the depth-psychological literature on trauma and dissociation, appearing across the corpus primarily as co-architect of the theory of structural dissociation of the personality and as the foremost modern champion of Pierre Janet's neglected clinical heritage. His collaborative work with Ellert Nijenhuis and Kathy Steele — culminating in the structural dissociation framework elaborated in 'The Haunted Self' — provides the theoretical spine for understanding how traumatized personalities fragment into apparently normal parts (ANP) and emotional parts (EP). Van der Hart's influence extends through multiple streams: his early partnership with Bessel van der Kolk rehabilitated Janet for contemporary trauma studies, his joint research with Nijenhuis produced the Somatoform Dissociation Questionnaire, and his phase-oriented treatment model informs virtually every major clinical protocol for complex PTSD and dissociative disorders discussed in the corpus. Ogden's sensorimotor psychotherapy draws explicitly on his concept of presentification, while Courtois's complex trauma treatment guidelines rest on structural dissociation premises. The corpus reveals no significant counter-voice to van der Hart; rather, authors position themselves as extending, applying, or operationalizing his framework, making him less a contested figure than a foundational authority whose theoretical vocabulary has become the lingua franca of contemporary dissociation research.
EPs experience these traumatic memories far too intensely, as 'too real'... Clinicians have long observed the fundamental differences between traumatic memories and autobiographical narrative memories
Van der Hart's own text establishes the ANP/EP distinction and the qualitative difference between traumatic and autobiographical memory as the foundational thesis of structural dissociation theory.
, The Haunted Self Structural Dissociation and the Treatmentthesis
dissociative parts thus need to become more open, complex, and flexible, more reflective in their actions, and more open to cooperation and coordination with the personality as a whole
Van der Hart articulates the therapeutic goal of structural dissociation treatment as increasing systemic openness and coordination among dissociated personality parts.
, The Haunted Self Structural Dissociation and the Treatmentthesis
it remains for the field to agree that all dissociative symptoms are manifestations of some degree of structural division of the personality
Van der Hart advances the unifying claim that all dissociative phenomena, across diagnostic categories, reflect structural division of personality rather than a merely phenomenological continuum.
, The Haunted Self Structural Dissociation and the Treatmentthesis
Presentification gives a sense of continuity over time and contributes to a stable sense of self (Van der Hart et al., 2006).
Ogden explicitly cites van der Hart's concept of presentification as the basis for understanding how embodied temporal orientation supports self-continuity in trauma treatment.
, Trauma and the Body: A Sensorimotor Approach to Psychotherapy, 2006supporting
Steele, K., van der Hart, O., & Nijenhuis, E. R. S. (2005). Phase-oriented treatment of structural dissociation in c
Ogden's bibliography documents the foundational Steele–van der Hart–Nijenhuis phase-oriented treatment model as a direct source for sensorimotor psychotherapy's clinical approach.
, Sensorimotor Psychotherapy Interventions for Trauma and, 2015supporting
Van der Kolk, B. A., & Van der Hart, O. (1989). Pierre Janet and the breakdown of adaptation in psychological trauma. American Journal of Psychiatry, 146, 1530–1540.
Ogden's reference list documents the seminal van der Kolk–van der Hart collaboration that recovered Janet's adaptive failure model for modern trauma theory.
, Trauma and the Body: A Sensorimotor Approach to Psychotherapy, 2006supporting
Van der Hart, O., & Friedman, B. (1989). A reader's guide to Pierre Janet on dissociation: A neglected intellectual heritage. Dissociation, 2, 1, 3-16.
Nijenhuis cites van der Hart's early scholarly recovery of Janet's dissociation theory as the intellectual foundation for the somatoform dissociation research programme.
, Somatoform Dissociation: Phenomena, Measurement, and Theoretical Issues, 2004supporting
Nijenhuis, E.R.S., Spinhoven, P., Van Dyck, R., Van der Hart, O., & Vanderlinden, J. (1996). The development and the characteristics of the Somatoform Dissociation
The bibliographic entry records van der Hart's co-authorship in the original development and validation of the Somatoform Dissociation Questionnaire.
, Somatoform Dissociation: Phenomena, Measurement, and Theoretical Issues, 2004supporting
Brown, P., & Van der Hart, O. (1998). Memories of sexual abuse: Janet's critique of Freud, a balanced approach. Psychological Report, 82, 1027-1043.
Nijenhuis cites van der Hart's work situating Janet's critique of Freud as a resource for a non-polemical, clinically balanced approach to traumatic memory.
, Somatoform Dissociation: Phenomena, Measurement, and Theoretical Issues, 2004supporting
Van der Kolk, B. A., McFarlane, A. C., & Van der Hart, O. (1996). A general approach to treatment of posttraumatic stress.
The citation documents van der Hart's co-authorship of the general PTSD treatment framework in the landmark 'Traumatic Stress' volume, establishing his place in mainstream trauma treatment literature.
, The Haunted Self Structural Dissociation and the Treatmentsupporting
An integrated personality includes a unified sense of self... ongoing integrative actions that support functioning in everyday life, including regulatory and reflective skills.
Courtois's account of personality integration in complex trauma treatment applies van der Hart's structural dissociation vocabulary of integrative action and mental efficiency to clinical guidelines.
, Treating Complex Traumatic Stress Disorders (Adults) supporting
the traumatic stress field needs more concerted efforts to study systematically the effectiveness of the principles and interventions of phase-oriented treatment of complex posttraumatic dissociative disorders
Courtois frames phase-oriented treatment — van der Hart's primary clinical contribution — as the paradigm requiring systematic empirical validation in complex dissociative disorder research.
, Treating Complex Traumatic Stress Disorders (Adults) supporting
the focus on symptom reduction and stabilization requires attending to the dysregulated sensorimotor, affective, and cognitive remnants of the trauma with the goal of stabilizing the client
Ogden's description of phase-oriented stabilization prior to memory work operationalizes van der Hart's three-phase treatment model without explicit citation at this point.
, Trauma and the Body: A Sensorimotor Approach to Psychotherapy, 2006aside