Researching targeted violence and contemporary criminality.

Published Research


  1. Goyens e a Typologieën van seksuele moord – een literat.  Tijdschrift voor Seksuologie (Journal of Sexuology).
  2. Some Warning Behaviors Discriminate Between School Shooters and Other Students of Concern.  Journal of Threat Assessment and Management.


  1. Typologieën van seksuele moord – een literatuurstudie.
  2. Predatory Violence and Psychopathy.  Psychopathy and Law.
  3. Understanding Violence: Does Psychoanalytic Thinking Matter?  Aggression and Violent Behavior.
  4. The Role of Warning Behaviors in Threat Assessment: An Exploration and Suggested Typology.  Behavioral Sciences and the Law.
  5. Disturbing Communications and Problematic Approaches to the Dutch Royal Family.  Journal of Forensic Psychiatry & Psychology.


  1. The Concept of Leakage in Threat Assessment.  Behavioral Sciences and the Law.
  2. Introduction to this Issue: International Perspectives on Stalking.  Behavioral Sciences and the Law.
  3. The Assassination of the Swedish Minister for Foreign Affairs.    Journal of Forensic Sciences.
  4. Attacks on German Public Figures, 1968-2004: Warning Behaviors, Potentially Lethal and Non-lethal Acts, Psychiatric Status, and Motivations.  Behavioral Sciences and the Law.
  5. Approaching and Attacking Public Figures: A Contemporary Analysis of Communications and Behavior.  In: Threatening Communications and Behavior: Perspectives on the Pursuit of Public Figures.  National Research Council, The National Academies Press.
  6. Wat doet u hier? Een vragenlijst voor beveiligers en politieambtenaren in het eerste contact met ‘approachers’. Master Thesis, Netherlands Police Academy.
    English title: What are you doing here?  A guideline for police and protection officers in their first contact with approachers.


  1. Persistence in Stalking: A Comparison of Associations in General Forensic and Public Figure Samples. Journal of Forensic Psychiatry & Psychology.
  2. Review of: Forensic and Medico-legal Aspects of Sexual Crimes and Unusual Sexual Practices. Journal of Forensic Sciences.
  3. Stalkers and Harassers of British Royalty: An Exploration of Proxy Behaviours for Violence. Behavioral Sciences and the Law.
  4. Abnormal Attentions Toward The British Royal Family: Factors Associated With Approach and Escalation. Journal of American Academy of Psychiatry & the Law.
  5. Factors Associated with Escalation and Problematic Approaches Toward Public Figures. Journal of Forensic Sciences.
  6. Zielgerichtete Gewalt und Amok an Schulen – Aktueller Erkenntnisstand und Ansätze der Prävention. Jugendhilfe.
    English title: Targeted violence and mass murder in schools – current knowledge and aspects of prevention.


  1. The Fixated and the Pursuit of Public Figures. The Journal of Forensic Psychiatry and Psychology.
  2. Stalkers and Harassers of Royalty: The Role of Mental Illness and Motivation. Psychological Medicine.
  3. Public Figures and Stalking in the European Context.  Eur J Crim Policy Res.
  4. Zielgerichtete schwere Gewalt und Amok an Schulen. Kriminalistik.
    English title: Severe targeted violence and mass murder in schools.
  5. De Psycholoog en het Opsporingsonderzoek.Nijmegen: Wolf Legal Publishers.
    English title: The Psychologist and Criminal Investigations.
  6. Aanslagen op Publieke Personen – tussen Overtuiging en Waanzin. Nijmegen: Wolf Legal Publishers.
    English title: Attacks on Public Figures: Between Conviction and Madness.


  1. The Public Figure Assassin as Terrorist In: Stalking, Threatening, and Attacking Public Figures: A Psychological and Behavioral Analysis. Oxford University Press.
  2. Attacks on the British Royal Family: The Role of Psychotic Illness. J Am Acad Psychiatry and the Law.
  3. Bedrohungsmanagement am Arbeitsplatz. Personalwirtschaft.
    English title: Threat Management at the Workplace.


  1. The Role of Mental Disorder in Attacks on European Politicians 1990-2004 Acta Psychiatrica Scandinavica.
  2. Dangerous Cases: When Treatment is Not an Option. In: B. van Luyn, S. Akhtar, J. Livesley, eds., Severe Personality Disorders: Major Issues in Everyday Practice.


  1. The Stalking of Public Figures: Management and Intervention.  J Forensic Sciences.



  1. Wie is de psychopaat onder ons?Het Tijdschrift voor de Politie.
    English Title: Who is the Psychopath Amongst Us?



  1. Gedragsanalyse in de Politiepraktijk.  Het Tijdschrift voor de Politie.
    English title:Behavioral Analysis Applied to Police Investigations.
  2. Amok – ein neuer Blick auf ein altes Phänomen. In C. Lorei (Hrsg.), Polizei & Psychologie.
    English title: Mass murder – A new look on an old phenomenon.