John Horgan is Professor at the Global Studies Institute and Department of Psychology, at Georgia State University. He has a BA and PhD in applied psychology, and his research focuses on terrorism and political violence - specifically on understanding psychological qualities of pathways into, through, and out of terrorism. John has previously held positions at the University of Massachusetts, Penn State University, the University of St. Andrews, UK, and University College, Cork, Ireland. His books include The Psychology of Terrorism (second edition published June 2014), Divided We Stand: The Strategy and Psychology of Ireland's Dissident Terrorists, Walking Away from Terrorism: Accounts of Disengagement from Radical and Extremist Movements, Leaving Terrorism Behind: Individual and Collective Disengagement, Terrorism Studies: A Reader, and The Future of Terrorism. He is Associate Editor of Terrorism and Political Violence, and serves on the Boards of such journals as Politics and the Life Sciences, Legal and Criminological Psychology, Studies in Conflict and Terrorism, Journal for Deradicalization and Journal of Strategic Security. His research has been featured in such venues as The New York Times, VICE News, New York Magazine, TIME, CNN, NBC, Rolling Stone, and the Chronicle of Higher Education. He lives in Atlanta, Georgia.