2017

• 'Sport and politics bedfellows from now on', The Weekend Australian, 23 September 2017, p. 45.

• 'Lone wolves voelen zich moreel superieur, zien zichzelf als helden', de Volkskrant (Netherlands), 5 August 2017, pp. 53-54.

• 'Are There Better Methods for Assessing and Preventing Lone Wolf Terrorism in the United States?', INFORUM (The Fourth Freedom Forum, USA), No. 3, 24 July 2017.

• 'Trapping lone wolves', Jerusalem Post (Israel), 29 June 2017.

• 'Zo opereren lone wolf-terroristen', Nieuwsbank (Netherlands), 28 June 2017.

• 'After 28 years, can Hillsborough survivors finally attain a sense of closure?', The42, 25 June 2017.

• 'Waar slaapt de "lone wolf"?', De Standaard (Belgium), 23 June 2017.

• 'IS is een roedel waarin een lone wolf zich thuis voelt', De Morgen (Belgium), 22 June 2017.

• 'Review of The Age of Lone Wolf Terrorism', The Times Higher Education (UK),14 June 2017. 

• 'Beyond Iraq and Syria: ISIS' Ability to Conduct Attacks Abroad', Lawfare, 15 June 2017.

• 'Having a voice and a sense of belonging in a soccer club', Pushing the Edge Podcast (with Greg Curran), 6 June 2017. 

• 'Thoughts on our approach to "The Age of Lone Wolf Terrorism"', Foreign Policy, 25 May 2017.

• 'IS: lok slachtoffer met koopje op verkoopsite', De Telegraaf (Netherlands), 10 May 2017.

• 'CBD security slow to start up', CBD News (Melbourne, Australia), 8 May 2017.

• 'Zo schadelijk is een slecht presterend Oranje', Nederlands Dagblad (Netherlands), 31 March 2017.

• 'Dissecting the ISIS attack on British Parliament: How it's similar to previous acts of terrorism, and where it deviates', New York Daily News, 24 March 2017.

• 'Lone actor terrorism: attack in London', ABC News Radio National (Australia), Drive with Marius Benson, 23 March 2017.

• 'Lone actor terrorism: attack in London', ABC Radio 774 Melbourne (Australia), Drive with Raphael Epstein, 23 March 2017.

• 'Hoofddader ‘Beverwijk’ in skybox de Kuip', NRC (Netherlands), 22 March 2017.

• 'Op zondagen zit deze hooligan weer in een skybox van de Kuip', NRC (Netherlands), 22 March 2017.

• 'Can Lone Wolves Be Stopped?', Lawfare, 15 March 2017.

• 'Jak zastavit útočící osamělé vlky', Český rozhlas (Czech Republic), 4 March 2017.

• 'As Islamic State Loses Territory, It Shifts Focus to High-Profile Terrorist Attacks', The Washington Diplomat, 31 January 2017.

• 'The Next Big Threat to National Security Is "Spoofing"', The New York Observer, 24 January 2017.

2016

• 'New footie hooligan craze?', Daily Star (UK), 17 December 2016.

• 'Videoscheidsrechter wekt illusie foutloze arbitrage', De Stentor (Netherlands), 16 December 2016, pp. 2-3.

• 'We Don’t Talk About "Radicalization" When an Attacker Isn’t Muslim. We Should.' The New York Times Magazine, 11 December 2016, p. 17.

• 'De vraag van Ed Degenkamp aan Ramón Spaaij', Sport Knowhow XL (Netherlands), 29 November 2016.

• 'Briga na floresta e arruaça no exterior. São os hooligans da vez na Europa', UOL (Brazil), 24 November 2016.

• 'Cruciaal moment voor de reputatie van Feyenoord', NRC Handelsblad (Netherlands), 24 November 2016, p. 8. 

• 'Lone Wolf Terrorism: Does It Exist In Indonesia?', Eurasia Review, 10 November 2016.

• 'America’s lone-wolf terrorists are unpredictable in almost every regard—except one', Quartz (USA), 19 October 2016.

• 'Feyenoord hooligans await Man Utd fans amid fears of "serious" clashes', Daily Star (UK), 15 September 2016.

• 'Angst voor lone wolf', Noordhollands Dagblad (Netherlands), 26 August 2016, p. 1. [Also published in De Gooi- en Eemlander, Leidsch Dagblad, Haarlems Dagblad en IJmuider Courant]

• 'FBI gaat tot het uiterste', Noordhollands Dagblad (Netherlands), 26 August 2016, p. 5. [Also published in De Gooi- en Eemlander, Leidsch Dagblad, Haarlems Dagblad en IJmuider Courant]

• 'Kijken in de schedel van de "lone wolf"', De Telegraaf (Netherlands), 20 August 2016, pp. 26-27.

• 'Messentrekker in Straatsburg was ook na-aper IS', AD/Algemeen Dagblad (Netherlands), 20 August 2016, p. 9.

• 'Dit is het jaar van de eenling', BN DeStem (Netherlands), 20 August 2016, p. 5.

• 'Eigen terreur (h)eerst: Waarom we moeten focussen op extreemrechts geweld, en niet alleen op de lone wolf-jihadi', De Morgen (Belgium), 13 August 2016, pp. 30-33.

• 'Database van lone wolves', De Morgen (Belgium), 13 August 2016.

• 'Eindelijk iets betekenen, dat is het', De Morgen (Belgium), 9 August 2016, pp. 4-5. 

• 'Germans Wonder if Terror Can Be Prevented', Der Spiegel Online International   (Germany), 1 August 2016.

• 'Angst vor der Angst', Der Spiegel (Germany), no. 31, 30 July 2016, p. 12. 

• 'Ataques de "lobos solitários": serão o maior risco que a Europa enfrenta?', Público (Portugal), 31 July 2016.

• 'Terrorismo: a matança como espetáculo', Época (Brazil), no. 946, 30 July 2016.

• 'Walging of verering is aan de aanschouwer', de Volkskrant (Netherlands), 30 July 2016, p. 28.

• 'We need to rethink the relationship between mental health and political violence', Open Democracy, 28 July 2016.

• 'Osamělých vlků přibývá a dají se snadno přehlédnout', Hospodářské Noviny (Czech Republic), 27 July 2016.

• 'A tactic called lone wolf terrorism', Press TV (Iran), 26 July 2016.

• ‘In het hart van de lone wolf schuilt een raadsel’, De Standaard (Belgium), 25 July 2016.

• 'Inside the Mind of the Munich Mass Killer', Psychology Today, 24 July 2016.

• 'Accounting for the rise of lone-wolf terrorists', Associated Press, 23 July 2016.

• 'Munich, Nice, Dallas: Are Lone-Wolf Attacks Becoming a Pattern?', The Quint (India), 23 July 2016.

• 'Einladung zum Jedermann-Dschihad', Berliner Morgenpost, 20 July 2016, p. 3.

• 'Die tiefen Wurzeln des Terrors', Neue Zürcher Zeitung (Switzerland), 19 July 2016.

• 'Atrocity in the City of Nice: An Act of Clinical Insanity?', Psychology Today, 18 July 2016.

• 'Axt-Angreifer war Islamist', Helmstedter Nachrichten (Germany), 18 July 2016.

• 'Occidente, frente al angustiante desafío del terrorismo low-tech', La Nación (Argentina), 16 July 2016.

• 'Lone Wolf Attacks Are Becoming More Common — And More Deadly', PBS FRONTLINE (United States), 14 July 2016.

• 'Research shows women want fashion AND function in active wear', Premium Official News, 29 June 2016.

• 'Sport en diversiteit: focus op de kartrekkers', E-zine Naar een veiliger sportklimaat (Netherlands), no. 11, June 2016, pp. 8-9.

• 'En toen vond Orlando plaats', KIJK Magazine (Netherlands), no. 7, 22 June 2016.

• 'Are lone wolves or terrorist groups more deadly? The answer depends on the country', The Washington Post, 19 June 2016.

• 'Police injured at funeral for Orlando victim', The New Daily (Australia), 19 June 2016.

• 'Terreuractie van Omar Mateen was typisch Amerikaans', NRC Handelsblad (Netherlands), 18 June 2016, p. 1.

• 'Lone wolf massacres are on the rise, experts warn', The New Daily (Australia), 17 June 2016.

• 'Einzeltäter sind nicht unsichtbar', Die Zeit (Germany), 16 June 2016.

• 'Lobos solitarios que escapan a los radares', Página 12 (Argentina), 16 June 2016.

• 'Voor de Russen zijn de Engelsen een trofee', NOS Nieuws (Netherlands), 13 June 2016. 

• 'Orlando Massacre: A History of Lone Wolf Terrorism in America', Oye! Times (Canada), 13 June 2016.

• 'Tackling integrity issues in sport head on', Sport and Recreation Victoria, Victorian Government Department of Health and Human Services (Australia), 17 May 2016.

• 'Are Fans No. 1?', ABC Radio (Australia), The Ticket, 7 May 2016.

• 'Three interesting takeaways on how sport can unite communities', Smart Cities & Sport, 2 May 2016.

• 'Invloed van fans op sporters valt mee', Trouw (Netherlands), 25 March 2016, p. 18.

• 'Gun Control Key to Guarding Against Lone-Wolf Terrorism in Europe', World Politics Review, 15 March 2016.

• 'Are Empty Stadiums Really the Best Way To Curb Anti-Social Spectator Behaviour?', The Huffington Post, 15 February 2016.

• ‘De meeste voetbalbezoekers hebben nooit last van supportersgeweld’,  Staantribune (Netherlands), No. 4, February 2016, pp. 24-29.

• 'De ongemakkelijke waarheid over het terroristenbrein', de Volkskrant (Netherlands), 22 January 2016.