World's Best Scientists 2026 revealed!

D-Index & Metrics

Political Science

D-Index
42
Citations
9666
World Ranking
430
National Ranking
240

Overview

John Horgan is affiliated with Georgia State University in the United States. Their research primarily spans the social sciences, with a focus on sociology, political science, and health-related topics. Their work encompasses various subfields, including sociology and political science, social psychology, political science and international relations, and artificial intelligence.

Their main research topics involve a detailed examination of terrorism, counterterrorism, and political violence. They have also explored areas related to gun ownership and violence research, religion and spirituality within psychological and societal contexts, bullying and aggression, political conflict and governance, as well as crime patterns and interventions.

Research publications by John Horgan include:

  • Picking Up and Defending the Faith: Activism and Radicalism Among Muslim Converts in the United States (2020, Political Psychology)
  • Disaggregating Lone-actor Grievance-fuelled Violence: Comparing Lone-actor Terrorists and Mass Murderers (2020, Terrorism and Political Violence)
  • Terrorist Transformations: The Link between Terrorist Roles and Terrorist Disengagement (2020, Studies in Conflict and Terrorism)
  • Similar crimes, similar behaviors? Comparing lone-actor terrorists and public mass murderers (2021, Journal of Forensic Sciences)
  • Impact of Perceived Peer Attitudes and Social Network Diversity on Violent Extremist Intentions (2020, Terrorism and Political Violence)

Their frequent coauthors include Daniel W. Snook, Ari Fodeman, Paul Gill, Noemié Bouhana, and James Silver.

John Horgan's research has been published predominantly in the journal Terrorism and Political Violence, followed by contributions to Behavioral Sciences of Terrorism and Political Aggression, Journal of School Psychology, Political Psychology, and Review of General Psychology.

Best Publications

  • The Psychology of Terrorism

    John G. Horgan

  • Walking Away from Terrorism: Accounts of Disengagement from Radical and Extremist Movements

    John G. Horgan

  • Leaving Terrorism Behind: Individual and Collective Disengagement

    Tore Bjorgo;John G. Horgan

  • Bombing Alone: Tracing the Motivations and Antecedent Behaviors of Lone-Actor Terrorists,,

    Paul Gill;John Horgan;A.B.D. Paige Deckert M.S.

  • Rehabilitating the Terrorists?: Challenges in Assessing the Effectiveness of De-radicalization Programs

    John Horgan;Kurt Braddock

  • A Conceptual Framework for Addressing Psychological Process in the Development of the Terrorist

    Max Taylor;John Horgan

  • The search for the terrorist personality.

    John Horgan

  • Towards a Guide for Constructing and Disseminating Counternarratives to Reduce Support for Terrorism

    Kurt Braddock;John Horgan

  • Turning away from terrorism Lessons from psychology, sociology, and criminology

    Mary Beth Altier;Christian N Thoroughgood;John G Horgan

  • Terrorist Use of the Internet by the Numbers: Quantifying Behaviors, Patterns and Processes

    Paul Gill;Emily Corner;Maura Conway;Amy Thornton

  • Playing the ‘Green Card’ – Financing the Provisional IRA: Part 1

    John Horgan;Max Taylor

  • The provisional Irish republican army: Command and functional structure

    John Horgan;Max. Taylor

  • Malevolent Creativity in Terrorist Organizations

    Paul Gill;John Horgan;Samuel T. Hunter;Lily D. Cushenbery

  • Individual Disengagement: A Psychological Analysis

    John Horgan

  • Deradicalization or disengagement? A process in need of clarity and a counterterrorism initiative in need of evaluation

    John Horgan

  • From Cubs to Lions: A Six Stage Model of Child Socialization into the Islamic State

    John G. Horgan;Max Taylor;Mia Bloom;Charlie Winter

  • A case against ‘Critical Terrorism Studies’

    John Horgan;Michael J. Boyle

  • Why They Leave: An Analysis of Terrorist Disengagement Events from Eighty-seven Autobiographical Accounts

    Mary Beth Altier;Emma Leonard Boyle;Neil D. Shortland;John G. Horgan

  • The Psychological and Behavioural Bases of Islamic Fundamentalism

    M. Taylor;J. Horgan

  • Interviewing the terrorists: reflections on fieldwork and implications for psychological research

    John Horgan

  • Who Were the Volunteers? 1 The Shifting Sociological and Operational Profile of 1240 Provisional Irish Republican Army Members

    Paul Gill;John Horgan

  • Walking away: the disengagement and de-radicalization of a violent right-wing extremist

    John Horgan;Mary Beth Altier;Neil Shortland;Max Taylor

  • The critical role of friends in networks for countering violent extremism: toward a theory of vicarious help-seeking

    Michael J. Williams;John G. Horgan;William P. Evans

  • Navigating ISIS’s Preferred Platform: Telegram1

    Mia Bloom;Hicham Tiflati;John Horgan

  • Rationales for terrorist violence in homegrown jihadist groups: A case study from the Netherlands

    Bart Schuurman;John G. Horgan

  • Relation of psychosocial factors to diverse behaviors and attitudes among Somali refugees.

    B. Heidi Ellis;Saida M. Abdi;Vanja Lazarevic;Matthew T. White

  • The Attitudes-Behaviors Corrective (ABC) Model of Violent Extremism

    James Khalil;John Horgan;Martine Zeuthen

  • In Their Own Words? Methodological Considerations in the Analysis of Terrorist Autobiographies

    Mary Beth Altier;John Horgan;Christian Thoroughgood

  • Risk assessment and the terrorist

    Karl Roberts;John Horgan

  • Psychology of terrorism: Introduction to the special issue.

    John G. Horgan

  • Trauma and Openness to Legal and Illegal Activism Among Somali Refugees

    B. Heidi Ellis;Saida M. Abdi;John G. Horgan;Alisa B. Miller

Frequent Co-Authors

Paul Gill
Paul Gill University College London
Jocelyn J. Bélanger
Jocelyn J. Bélanger New York University
Kathleen M. Carley
Kathleen M. Carley Carnegie Mellon University
Daniel S. Messinger
Daniel S. Messinger University of Miami
William H. Fisher
William H. Fisher University of Massachusetts Lowell
Victor Asal
Victor Asal University at Albany, State University of New York
James A. Piazza
James A. Piazza Pennsylvania State University

If you think any of the details on this page are incorrect, let us know.

Report an issue

We appreciate your kind effort to assist us to improve this page, it would be helpful providing us with as much detail as possible in the text box below:

Related Online Degrees & Career Pathways

Studying Political Science opens doors to a variety of related online degrees and diverse career opportunities. Many students with a passion for research, organization, and data management find value in exploring the best online library science programs. These programs can help develop advanced information management skills, which are highly valued in government agencies and think tanks.

For those interested in understanding societal changes and key historical events shaping modern politics, pursuing majors in history can offer a strong complementary perspective. Advanced study options are also available for professionals seeking further specialization, such as affordable online masters in history—ideal for deepening your expertise or preparing for roles in academia, research, or public service.

If your interests span several disciplines or you prefer a customized academic experience, consider exploring the best online interdisciplinary studies degree programs. These can help you blend Political Science with Economics, Communications, or Public Administration, tailoring your education to your unique career goals in policy analysis, advocacy, or the nonprofit sector.

Best Scientists Citing John Horgan

Trending Scientists