John Horgan (political psychologist)

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Dr. John Horgan

Dr. John Horgan (born 1974) is Professor of Global Studies and Psychology at Georgia State University, Atlanta. Horgan has previously held positions at the University of Massachusetts, Lowell, Penn State, the University of St. Andrews, and University College, Cork.


He was awarded his PhD (Applied Psychology) in 2000 by University College, Cork. While in Ireland, he spent several years conducting detailed research on Irish Republican movements, and published several articles (some of which appeared in the journal Terrorism and Political Violence) on the fundraising activities of the Provisional IRA. He is engaged in extensive research on involvement and engagement in terrorism, and his current research projects focus on issues of disengagement and de-radicalization from terrorist movements. Some of his research on this subject was published in the journals 'Terrorism and Political Violence', 'Studies in Conflict and Terrorism', 'The Georgetown Journal of International Affairs', and 'Dynamics of Asymmetric Conflict'. Horgan has written several books on terrorism, and these include 'The Psychology of Terrorism' (2005 and 2014), 'Divided We Stand: The Strategy and Psychology of Ireland's Dissident Terrorists' (2012) and 'The Future of Terrorism' (1999, with Max Taylor). Horgan is involved in a long-term project on understanding the psychology of terrorist behaviour and promoting the scientific study of terrorism.

He is Editor of the journal 'Dynamics of Asymmetric Conflict', and serves on the Editorial Boards of several journals including 'Studies in Conflict and Terrorism', 'Terrorism and Political Violence', 'Journal of Strategic Security', and 'Legal and Criminological Psychology'.

In 2006, Horgan became a recipient of an Airey Neave Trust Fellowship Award, and he has since been awarded multiple grants for his research on terrorist behavior. In 2010, following his consultancy work with the FBI's Behavioral Analysis Unit (BAU), he was appointed to the Research Advisory Board of the FBI's National Center for the Analysis of Violent Crime (NCAVC) until its official disbandment in 2012. In August 2012 he became a member of the new NCAVC Research Working Group.

Horgan is a native of Castleisland, Co. Kerry, in the Republic of Ireland.


Horgan, J. (2014). The Psychology of Terrorism, 2nd Edition. London: Routledge.

Horgan, J. (2013). Divided We Stand: The Psychology and Strategy of Ireland's Dissident Terrorists. New York: Oxford University Press.

Horgan, J. and Braddock, K. (2011)Terrorism: A Reader. London and New York: Routledge.

Horgan, J. (2009). Walking Away from Terrorism: Accounts of Disengagement from Radical and Extremist Movements. London and New York: Routledge.

Bjorgo, T. and Horgan, J. (Eds.) (2009). Leaving Terrorism Behind: Individual and Collective Disengagement. London: Routledge.

Horgan, J. (2005). Psychology of Terrorism. London: Routledge.

Taylor, M. and Horgan, J. (Eds.) (2000). The Future of Terrorism. London: Frank Cass & Co.

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