2019
‘The chaotic world of Indonesia's violent ultras’, These Football Times, 6 February 2019.
‘Geen wetenschappelijk bewijs voor psychische stoornis bij terroristen’, Het Laatste Nieuws (Belgium), 5 February 2019.
‘Geen bewijs voor stoornis bij terrorist’, Het Parool (Netherlands), 5 February 2019.
‘Are terrorists mentally ill? UvA research project on role of psychopathology in terrorism’, ENP Newswire, 6 February 2019.
‘Zijn terroristen psychisch ziek?’, University of Amsterdam Media Release, 5 February 2019.
‘Psychopathologie en terrorisme: Stand van zaken, lacunes en prioriteiten voor toekomstig onderzoek’, Research and Documentation Centre (WODC), Ministry of Justice and Security, 23 January 2019.
2018
‘Van kennis naar maatschappelijke impact: De toenemende aandacht voor valorisatie in het (sport)wetenschappelijk onderzoek’, Sport & Strategie (Editie Vlaanderen / Belgium), Vol. 5, No. 4, December, pp. 20-21.
‘The evolving threat of lone-actor terrorism’, Inside Story (Australia), 15 November 2018.
‘Waarom de voetbaltribunes zo wit zien’, BRUZZ (Belgium), 14 November 2018.
‘Os “hooligans” praticam violência como forma de demonstrarem a sua masculinidade tóxica’, Jornal Económico (Portugal), 13 November 2018.
‘Social media is a “force multiplier” for a lone wolf on the edge’, The Hill, 5 November 2018.
‘“Lone wolves” and the rhetoric that fuels them’, The Christian Science Monitor, 30 October 2018.
‘A Look Into the Evidence That “Lone Wolf” Terrorists Are a Pack’, Pacific Standard, 29 October 2018.
‘Waarom gaan hardlopen en veel geld verdienen vaak hand in hand?’ Vice Money (Netherlands), 8 October 2018.
'What Soccer Hooligans and Terrorists Have in Common', Haaretz (Israel), 1 June 2018.
‘Har autisme skylda for massakrer?’, Fri Tanke (Norway), 15 May 2018.
'Commonwealth Games injuries highlight a problematic culture in elite sports', The Conversation, 11 April 2018. [Republished in the New Zealand Herald, 12 April 2018]
'Diversity a boon for junior sports but clubs under pressure to perform', The Age (Australia), 30 March 2018, pp. 2-3. [Also published in The Sydney Morning Herald, 30 March 2018]
'Over de grens: Onderzoek naar grensoverschrijdend gedrag in het jeugdvoetbal', Utrecht University News (Netherlands), 20 March 2018.
'Practical steps to supporting diversity in junior sport', Play by the Rules (Australia), 12 March 2018.
'The Age of Lone Wolf Terrorism', New Books Network Podcast (United States), 19 January 2018.
2017
'Robbie Dunne presenta el primer libro sobre el Rayo en inglés', Diario As (Spain), 20 November 2017.
'Marokko naar het WK voetbal - hoe gaat Nederland dat organiseren?', de Volkskrant (Netherlands), 13 November 2017.
'Le "loup solitaire" n’est jamais loin de la meute', Slate (France), 9 November 2017.
'Référendum catalan : tiraillé par différents courants politiques, l'Espanyol Barcelone joue la carte de l'apolitisme', France Football (France), 23 October 2017.
'How FC Barcelona became the beating heart of the battle for Catalan independence', The 42, 7 October 2017.
'Waarom een multimiljonair 59 mensen de dood injaagt', De Standaard (Belgium), 4 October 2017.
'Terrorism expert discusses "lone wolves"', Tribune-Star (Indiana, USA), 3 October 2017.
'Wat drijft de lonewolfterrorist?', HUMO (Belgium), 25 September 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?', The 42, 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.