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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” (book chapter, Conceptualizing Extreme Beliefs and Behaviors, Oxford University Press, 05/08/2025). With Rik Peels, Ruth Rebecca Tietjen, and John Horgan. Uncorrected proofs available on request.
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)