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Books:
Extremism (MIT Press, August 2018)
The Social C0nstruction of Extremism (dissertation), 2024
ISIS: The State of Terror (Harper-Collins, 2015/2016), with Jessica E. Stern
Jihad Joe: Americans Who Go to War in the Name of Islam (Potomac Books, 2011)
Optimal (KDP, 2020)
Peer-reviewed articles, chapters and papers:
“Online Extremism” (book chapter, Routledge Handbook of Online Violent Extremism, Routledge, forthcoming 2026). Uncorrected proofs available on request.
“Extremism, Fanaticism, Fundamentalism, Terrorism: A Conceptual Map.” Chapter. Conceptualizing Extreme Beliefs and Behaviors, Oxford University Press. With Rik Peels, Ruth Rebecca Tietjen, and John Horgan.
The Social Construction of Extremism. Doctoral dissertation. Swansea University School of Law. 31/12/2024.
The ISIS Twitter Census (The Brookings Institution)
The Alt-Right Twitter Census (VOX-Pol)
There and Back Again: How White Nationalist Ephemera Travels Between Online and Offline Spaces (The RUSI Journal), with K. Aryaeinejad, K., & S. Looney
The Metronome of Apocalyptic Time: Social Media as Carrier Wave for Millenarian Contagion (Perspectives on Terrorism)
Extremist Construction of Identity (ICCT – The Hague)
Deconstruction of Identity Concepts in ISIS Propaganda (ICCT – The Hague)
The Turner Legacy: The Origins of White Nationalism's 'Bible' (ICCT – The Hague)
A Paler Shade of White: Identity & In-group Critique in James Mason’s Siege (RESOLVE Network)
Without Prejudice: What Sovereign Citizens Believe (George Washington University Program on Extremism)
The Enduring Appeal of Awlaqi's "Constants of Jihad" (CTC Sentinel)
Other publications of note:
Our Consensus Reality Has Shattered (The Atlantic, 2020)
Lawful Extremism: Extremist Ideology and the Dred Scott Decision (Center on Terrorism, Extremism, and Counterterrorism, 2023)
Lawful Extremism: The Chinese Exclusion Act (with Beth Daviess; Center on Terrorism, Extremism, and Counterterrorism, 2024)
Lawful Extremism: Florida's Anti-Trans Laws (with Beth Daviess; Center on Terrorism, Extremism, and Counterterrorism, 2024)
Who Matters Online: Measuring influence, evaluating content and countering violent extremism in online social networks (ICSR, with Bill Strathearn)
Omar and Me: My strange relationship with an American terrorist (Foreign Policy)
PATCON: The FBI’s Secret War Against the ‘Patriot’ Movement,and How Infiltration Tactics Relate to Radicalization (New America Foundation)