James Densley

James Densley
Born (1982-04-13) 13 April 1982
Leicester, England
EducationUniversity of Oxford
University of Northampton
Pace University
Alma materSt. Antony's College, Oxford
OccupationProfessor
EmployerMetropolitan State University
Known forGang Research
Criminology
Sociology
Awards2022 Minnesota Book Awards
2017 Points of Light
Websitejamesdensley.com

James Densley (born 13 April 1982) is a British-American sociologist and Professor of Criminology and Criminal Justice at Metropolitan State University. He is best known as co-founder of The Violence Prevention Project[1] and as co-author of the bestselling book, The Violence Project: How To Stop a Mass Shooting Epidemic.[2] In addition to his research on gun violence, Densley has published extensively on gangs and has been described as "among the most accomplished rising leaders of modern gang research in criminology."[3] He was ranked among the top 2% of scientists and 150 most cited criminologists worldwide in 2025.[4]

Densley is noted for his ethnograpic study of gang life in London[5] and for applying economic signalling theory to gang membership.[6][7][8] Densley's research examines group processes in gangs and compares them with other violent collectives, including hate groups and terror groups.[9][10] He has likened the Islamic State to a “street gang on steroids.”[11] His work also addresses the “glocalisation” of gang culture,[12] cyber violence,[13] and the influence of rap music and social media on gang-related violence.[14][15][16]

Early life and education

James Densley was born in Leicester, England, the son of a Leicestershire special constable.[17] He received a B.A. in sociology with American studies from the University of Northampton in 2003,[18] followed by an M.S. in sociology from the University of Oxford in 2004. He then moved to New York City, where he joined the NYC Teaching Fellows program and taught special education for grades 7 and 8 at University Neighborhood Middle School in the Lower East Side of Manhattan.[19] During this period, he earned a teaching license and a master's degree in education from Pace University.

In 2007, Densley returned to England to pursue a D.Phil. in sociology at the University of Oxford's Extra-Legal Governance Institute.[20] He studied under mafia scholars Diego Gambetta and Federico Varese, whose research on organized crime influenced his own work on social organization, theory, and method.[21]

Career

After completing his D.Phil. in 2011, Densley joined the faculty of Metropolitan State University in Minnesota. He was promoted to full professor in 2019 at the age of 37.[22]

The 2011 England riots took place shortly after Densley finished his doctoral research on gangs in London. When Prime Minister David Cameron attributed the riots to gangs,[23] Densley was among the first academics to question that claim.[24][25] His first book, How Gangs Work, grew out of his D.Phil., and examined the “war on gangs” launched in the aftermath of the riots.[5] A review in The British Journal of Criminology described the book as “critical ethnography and first-class fieldwork,” concluding that “Densley's work points the way to how gang research should be done in the future.”[26]

In the book and in later research, Densley used signaling theory to make sense of how and why youth join gangs.[27][28] He found that prospective gang members signal their potential value to the gang by engaging in violent and criminal acts that are beyond the capacity of most people.[6] Densley also used signaling theory to advance a model of disengagement from gangs that allows ex-gang members to communicate their unobservable inner change to others and satisfy community expectations that desistance from crime is real.[7] For Densley, religious conversion in prison was one example of a disengagement signal.[29]

Densley's work explores the rationality of gang behavior.[30] He developed a model of gang evolution explaining the relationship between gangs and organized crime.[31] The model proposes that recreation, crime, enterprise, and governance are not fixed gang types, but sequential "actualization stages" in the gang lifecycle. Subsequent studies of gangs in London and Glasgow provided empirical support for this framework.[32][33]

Densley has also studied illicit drug markets.[34] In 2012, he described the county lines model, in which urban gangs dispatch young or vulnerable members to sell drugs in smaller towns and commuter cities: “Most youngers are employed by their elders to work what was known colloquially as the ‘drugs line,’ although some are sent out ‘on assignment’ to explore ‘new markets’ in areas where they are unknown to police; notably commuter cities with vibrant nighttime economies”.[35] Later research by Densley addressed debt bondage and child exploitation within county lines,[36][37] and analyzed how expressive uses of social media, such as posting rap videos on YouTube, contribute to the commercial expansion of these networks.[14]

The Violence Project

In 2017, Densley and psychologist Jillian Peterson of Hamline University co-founded The Violence Project.[38] Their first initiative, in partnership with the Minnetonka Police Department, was the development of a mental illness crisis intervention training for law enforcement known as the R-Model.[39][40][41]

With funding from the National Institute of Justice, Densley and Peterson created a database of all public mass shooters since 1966 coded on more than 150 life history variables.[42] Their research has examined K-12 school shootings[43] and the influence of the Columbine High School massacre as a model for subsequent attacks.[44] Densley and Peterson have also criticized active shooter drills in schools, arguing that such exercises can traumatize children and normalize violence.[45][46]

In a viral 2019 op-ed for the Los Angeles Times,[47] Densley and Peterson outlined a framework for understanding mass shootings. Drawing on interviews with perpetrators and their acquaintances, they identified four recurring themes: early childhood trauma, an crisis point involving suicidality, validation through the study of prior shootings, and access to firearms. They argue that addressing each factor—through firearm regulation, suicide prevention, social support, and limiting media contagion—can help prevent future attacks. This framework is expanded in their book, The Violence Project: How To Stop a Mass Shooting Epidemic,[2] which "identifies 34 potential solutions" to the "uniquely American problem" of mass shootings.[48] Their research has also emphasized that many mass shooters "leak" their intent beforehand as a cry for help, suggesting opportunities for early intervention.[49]

The Violence Project continues to maintain open-source databases tracking mass public shootings, as well as homicides in schools, places of worship, college campuses, workplaces, and attacks on elected officials.[50] Analyses of these data, including a Bloomberg report following the 2025 killing of conservative activist Charlie Kirk, have been used to highlight trends in political violence in the United States.[51]

Growing Against Violence

Densley is a co-founder of Growing Against Violence, a London-based charity established in 2008 that delivers violence prevention programs in schools.[52] He wrote and piloted the original curriculum and later evaluated the program.[53] In 2017, Densley received the Prime Minister's Points of Light award for volunteer service.[54]

Selected publications

Densley is a TEDx speaker[55] and has written op-eds and commentary for CNN,[56] Daily Mail,[57] Education Week,[58] The Guardian,[59] The Hill,[60] the Los Angeles Times,[61] Newsweek,[62] The New York Times,[63] Scientific American,[64] the Star Tribune,[65] The Sun, Time,[66] USA Today,[67] The Wall Street Journal,[68] and The Washington Post.[69] His writing has addressed topics such as gangs, drug markets, school shootings, gun violence, knife crime, policing, and violent extremism.

His research and commentary have been featured on Last Week Tonight with John Oliver, and he has appeared on programs including, 60 Minutes, Andrea Mitchell Reports, BBC News, CBS This Morning, CNN Newsroom, Deadline: White House, Don Lemon Tonight, Dr. Phil, Face the Nation, Inside Edition, Morning Joe, The New Yorker Radio Hour, NBC Nightly News, NPR, and PBS NewsHour.

  • The Oxford Handbook of Gangs and Society (Oxford University Press, 2024). With David Pyrooz and John Leverso.
  • The Conversation on Guns (Johns Hopkins University Press, 2023).
  • Police, Prosecutors, Courts, and the Constitution (Springer, 2023). With Charles MacLean.
  • Contesting County Lines (Bristol University Press, 2023). With Robert McLean and Carlton Brick.
  • On Gangs (Temple University Press, 2022). With Scott Decker and David Pyrooz.
  • Robbery in the Illegal Drugs Trade (Bristol University Press, 2022). With Robert McLean.
  • The Violence Project: How to Stop a Mass Shooting Epidemic (Abrams Press, 2021). With Jillian Peterson.
  • Scotland's Gang Members (Palgrave Macmillan, 2020). With Robert McLean.
  • County Lines (Springer, 2019). With Robert McLean and Grace Robinson.
  • Minnesota's Criminal Justice System (Carolina Academic Press, 2016). With Jeff Bumgarner and Susan Hilal.
  • How Gangs Work (Palgrave Macmillan, 2013).

Awards

The character Jamie Patterson in the spy novel Jihadi Apprentice by David Bruns and J.R. Olson is based on Densley.[72]

References

  1. ^ "Mass Shooting Data & Research". The Violence Project. Retrieved 24 March 2021.
  2. ^ a b Peterson, Jillian; Densley, James (7 September 2021). The Violence Project: How to Stop a Mass Shooting Epidemic. Abrams Press. ISBN 978-1419752957.
  3. ^ Piquero, Alex R. (10 May 2018). "Linking Race-Based Perceptions of Gangs to Criminals and Athletes". Society. 55 (3): 237–242. doi:10.1007/s12115-018-0244-z. ISSN 0147-2011. S2CID 150286013.
  4. ^ Loannidis, John P. A. (19 September 2025). "August 2025 data-update for "Updated science-wide author databases of standardized citation indicators"". Elsevier Data Repository. 8. doi:10.17632/btchxktzyw.8 – via Elsevier.
  5. ^ a b Densley, James A. (2013). How gangs work : an ethnography of youth violence. Houndmills, Basingstoke, Hampshire: Palgrave Macmillan. ISBN 9781137271518. OCLC 842155883.
  6. ^ a b Densley, James A. (1 August 2012). "Street Gang Recruitment: Signaling, Screening, and Selection". Social Problems. 59 (3): 301–321. doi:10.1525/sp.2012.59.3.301. ISSN 0037-7791.
  7. ^ a b Densley, James A.; Pyrooz, David C. (2 August 2017). "A Signaling Perspective on Disengagement from Gangs". Justice Quarterly. 36: 31–58. doi:10.1080/07418825.2017.1357743. ISSN 0741-8825. S2CID 148914158.
  8. ^ Pyrooz, David C.; Densley, James A. (9 December 2015). "Selection into Street Gangs". Journal of Research in Crime and Delinquency. 53 (4): 447–481. doi:10.1177/0022427815619462. ISSN 0022-4278. S2CID 146763436.
  9. ^ Densley, James; Peterson, Jillian (1 February 2018). "Group Aggression". Current Opinion in Psychology. 19: 43–48. doi:10.1016/j.copsyc.2017.03.031. PMID 29279221.
  10. ^ Pyrooz, David C.; Densley, James A. (1 June 2018). "On Public Protest, Violence, and Street Gangs". Society. 55 (3): 229–236. doi:10.1007/s12115-018-0242-1. ISSN 1936-4725. S2CID 149677533.
  11. ^ Densley, James (7 October 2014). "ISIS: The street gang on steroids". CNN.
  12. ^ Van Hellemont, Elke; Densley, James A (7 March 2018). "Gang glocalization: How the global mediascape creates and shapes local gang realities" (PDF). Crime, Media, Culture. 15: 169–189. doi:10.1177/1741659018760107. ISSN 1741-6590. S2CID 148637493.
  13. ^ Peterson, Jillian; Densley, James (2017). "Cyber violence: What do we know and where do we go from here?". Aggression and Violent Behavior. 34: 193–200. doi:10.1016/j.avb.2017.01.012. ISSN 1359-1789. S2CID 151762431.
  14. ^ a b Storrod, Michelle L.; Densley, James A. (28 November 2016). "'Going viral' and 'Going country': the expressive and instrumental activities of street gangs on social media". Journal of Youth Studies. 20 (6): 677–696. doi:10.1080/13676261.2016.1260694. ISSN 1367-6261. S2CID 151516320.
  15. ^ Lauger, Timothy R.; Densley, James A. (19 June 2017). "Broadcasting Badness: Violence, Identity, and Performance in the Online Gang Rap Scene". Justice Quarterly. 35 (5): 816–84. doi:10.1080/07418825.2017.1341542. ISSN 0741-8825. S2CID 149250807.
  16. ^ Irwin-Rogers, Keir; Densley, James; Pinkney, Craig (4 January 2018), Gang Violence and Social Media, Routledge, pp. 400–410, ISBN 9781138668188, retrieved 3 August 2018
  17. ^ Miller, Alex (16 December 2023). "Can these scientists stop America's next mass shooting?". The Sunday Times. ISSN 0140-0460. Retrieved 16 December 2023.
  18. ^ "James Densley – BA (Hons) Sociology with American Studies – University of Northampton". University of Northampton.
  19. ^ Densley, J. (2012). Street gang recruitment: Signaling, screening and selection. Social Problems, 59(3), 301–321. doi: 10.1525/sp.2012.59.3.301.
  20. ^ "Home". Exlegi. Retrieved 13 September 2025.
  21. ^ Densley, James A.; Hamill, Heather (1 January 2011). Under the hood: the mechanics of London's street gangs (Thesis). Oxford University, UK.
  22. ^ "James Densley | Metro State University". www.metrostate.edu. Retrieved 16 December 2023.
  23. ^ "Riots: Cameron statement in full". BBC News. 11 August 2011.
  24. ^ Ambrogi, Stefano (12 August 2011). "Riots are a cry for help: ex London gang leader". Reuters.
  25. ^ Densley, James; Mason, Nick (1 October 2011). "The London Riots: A Gang Problem?". Policing Today. 17: 14–15 – via ResearchGate.
  26. ^ Harding, S. (5 February 2014). "Youth Gangs, Violence and Social Respect. By R. White (Palgrave Macmillan, 2013, 227 pp. 55.00) * How Gangs Work: An Ethnography of Youth Violence. By J. Densley (Palgrave Macmillan, 2013, 213 pp. 55.00)". British Journal of Criminology. 54 (2): 368–373. doi:10.1093/bjc/azt078.
  27. ^ Densley, James A. (25 September 2015), "Joining the Gang", The Handbook of Gangs, John Wiley & Sons, Inc, pp. 235–256, doi:10.1002/9781118726822.ch13, ISBN 9781118726822
  28. ^ Densley, James A. (28 August 2018). "Gang Joining". Oxford Research Encyclopedia of Criminology and Criminal Justice. doi:10.1093/acrefore/9780190264079.013.437. ISBN 9780190264079.
  29. ^ Johnson, Andrew; Densley, James (18 May 2018). "Rio's New Social Order: How Religion Signals Disengagement from Prison Gangs". Qualitative Sociology. 41 (2): 243–262. doi:10.1007/s11133-018-9379-x. ISSN 0162-0436. S2CID 150247394.
  30. ^ Siegel, Larry J. (28 February 2014). Criminology: The Core. Cengage Learning. ISBN 9781285965543 – via Google Books.
  31. ^ Densley, James A. (4 April 2012). "It's Gang Life, But Not As We Know It". Crime & Delinquency. 60 (4): 517–546. doi:10.1177/0011128712437912. ISSN 0011-1287. S2CID 145149869.
  32. ^ Whittaker, Andrew; Densley, James; Cheston, Len; Tyrell, Tajae; Higgins, Martyn; Felix-Baptiste, Claire; Havard, Tirion (13 March 2019). "Reluctant Gangsters Revisited: The Evolution of Gangs from Postcodes to Profits" (PDF). European Journal on Criminal Policy and Research. 26: 1–22. doi:10.1007/s10610-019-09408-4. ISSN 1572-9869. S2CID 151012724.
  33. ^ McLean, Robert (25 January 2017). "An Evolving Gang Model in Contemporary Scotland" (PDF). Deviant Behavior. 39 (3): 309–321. doi:10.1080/01639625.2016.1272969. ISSN 0163-9625. S2CID 151466279.
  34. ^ Densley, James; McLean, Robert; Deuchar, Ross; Harding, Simon (2018). "An altered state? Emergent changes to illicit drug markets and distribution networks in scotland" (PDF). International Journal of Drug Policy. 58: 113–120. doi:10.1016/j.drugpo.2018.05.011. ISSN 0955-3959. PMID 29908515. S2CID 49305888.
  35. ^ Densley, J. (2014). It's gang life, but not as we know it: The evolution of gang business. Crime & Delinquency, 60(4), 517–546. doi: 10.1177/0011128712437912. Page 533.
  36. ^ Robinson, Grace; McLean, Robert; Densley, James (19 October 2018). "Working County Lines: Child Criminal Exploitation and Illicit Drug Dealing in Glasgow and Merseyside" (PDF). International Journal of Offender Therapy and Comparative Criminology. 63 (5): 694–711. doi:10.1177/0306624x18806742. ISSN 0306-624X. PMID 30338710. S2CID 53015950.
  37. ^ Robinson, Grace; Densley, James; McLean, Robert (2018). "County lines: the dark realities of life for teenage drug runners". The Conversation. Retrieved 21 October 2018.
  38. ^ "The Violence Project (@theviolencepro) | Twitter". twitter.com. Retrieved 31 July 2018.
  39. ^ "How a Minnesota program could become the new standard in crisis intervention training". Star Tribune. Retrieved 31 July 2018.
  40. ^ Collins, Jon. "Minnetonka cops connect with mental health workers to defuse crises". Minnesota Public Radio News. Retrieved 4 September 2018.
  41. ^ Peterson, Jillian; Densley, James; Erickson, Gina (30 July 2019). "Evaluation of 'the R-Model' crisis intervention de-escalation training for law enforcement". The Police Journal. 93 (4): 271–289. doi:10.1177/0032258X19864997. ISSN 0032-258X. S2CID 201341154.
  42. ^ "Minnesota researchers create mass shooting database". AP News. Retrieved 31 July 2018.
  43. ^ Densley, James; Peterson, Jillian (8 February 2019). "School shooters usually show these signs of distress long before they open fire, our database shows". The Conversation. Retrieved 21 April 2019.
  44. ^ "School shootings didn't start in 1999 at Columbine. Here's why that disaster became a blueprint for other killers and created the 'Columbine generation'". The Washington Post. 18 April 2019.
  45. ^ Shockman, Elizabeth (27 March 2019). "Minnesota researchers say we're still getting school safety wrong". www.mprnews.org. Retrieved 21 April 2019.
  46. ^ Shamus, Kristen Jordan. "America changed: Anxiety simmers as mass shootings loom any time, anywhere". Detroit Free Press. Retrieved 11 August 2019.
  47. ^ "Op-Ed: We have studied every mass shooting since 1966. Here's what we've learned about the shooters". Los Angeles Times. 4 August 2019. Retrieved 11 August 2019.
  48. ^ Tribune, Reid Forgrave Star (3 December 2021). "Two Minnesota professors have devoted their careers to researching mass shooters". Star Tribune. Retrieved 10 December 2021.
  49. ^ Peterson, Jillian; Erickson, Gina; Knapp, Kyle; Densley, James (4 November 2021). "Communication of Intent to Do Harm Preceding Mass Public Shootings in the United States, 1966 to 2019". JAMA Network Open. 4 (11): e2133073. doi:10.1001/jamanetworkopen.2021.33073. ISSN 2574-3805. PMC 8569489. PMID 34735012.
  50. ^ "Violence Prevention Project Research | Hamline University - Minnesota". www.hamline.edu. Retrieved 13 September 2025.
  51. ^ Pandi, Swati (12 September 2025). "US political violence surges to record". Bloomberg.
  52. ^ "Prof. James Densley recognized with UK Prime Minister's Points of Light Award". www.metrostate.edu. Retrieved 16 June 2019.
  53. ^ "PsycNET". psycnet.apa.org. Retrieved 16 June 2019.
  54. ^ "Growing Against Violence". Points of Light. 29 August 2017. Retrieved 16 June 2019.
  55. ^ "Violence in the Age of Social Media". TEDx. 8 May 2019. Retrieved 8 May 2019.
  56. ^ Densley, Jillian Peterson,James (28 March 2023). "Opinion: Crumbley parents lose their appeal. Why that could be a game changer on school shootings". CNN. Retrieved 13 September 2025.{{cite web}}: CS1 maint: multiple names: authors list (link)
  57. ^ Densley, Prof James (29 August 2025). "The Minneapolis shooter's secret obsession has sickened me to my core". Mail Online. Retrieved 13 September 2025.
  58. ^ Peterson, Jillian; Densley, James (9 October 2019). "What School Shooters Have in Common". Education Week. ISSN 0277-4232. Retrieved 7 June 2022.
  59. ^ Whittaker, Andrew; Densley, James (15 January 2019). "London's gangs have changed, and it's driving a surge in pitiless violence | Andrew Whittaker and James Densley". The Guardian. ISSN 0261-3077. Retrieved 21 February 2019.
  60. ^ Densley, James; Pyrooz, David; Peterson, Jillian (9 September 2025). "Americans aren't as divided on mass shootings as politics makes it seem". The Hill.
  61. ^ Densley, James; Pyrooz; Decker (10 December 2021). "Op-Ed: The real cultural significance of 'West Side Story'? It spread powerful myths about gangs". Los Angeles Times. Retrieved 7 June 2022.
  62. ^ Leverso, John; Densley, James (21 March 2025). "Deportation by Race, Ethnicity, or National Origin Never ..." Newsweek. Retrieved 13 September 2025.
  63. ^ Peterson, Jillian; Densley, James (26 January 2023). "Opinion | We Profiled the 'Signs of Crisis' in 50 Years of Mass Shootings. This Is What We Found". The New York Times. ISSN 0362-4331. Retrieved 26 January 2023.
  64. ^ Densley, James; Peterson, Jillian. "What We Know about Mass School Shootings—and Shooters—in the U.S." Scientific American. Retrieved 7 June 2022.
  65. ^ Densley, James; Peterson, Jillian (3 September 2025). "Counterpoint | Mass shootings demand layered solutions, and that includes sensible gun laws". www.startribune.com. Retrieved 13 September 2025.
  66. ^ James Densley and Jillian Peterson. "The Steps We Can Take to Reduce Mass Shootings in America". TIME. Archived from the original on 14 June 2025. Retrieved 13 September 2025.
  67. ^ "We can do more to prevent mass workplace shootings like Aurora, Illinois". USA TODAY. Retrieved 21 February 2019.
  68. ^ Pyrooz, David; Densley, James (17 September 2017). "To Deal With Antifa, Designate It a Street Gang". The Wall Street Journal. ISSN 0099-9660. Retrieved 21 February 2019.
  69. ^ Densley, James; Peterson, Jillian (15 May 2022). "Opinion | Hate is not at the root of most mass shootings". The Washington Post. ISSN 0190-8286. Retrieved 13 September 2025.
  70. ^ "Minnesota Book Awards Winners & Finalists". The Friends of the Saint Paul Public Library. 4 September 2017. Retrieved 22 April 2022.
  71. ^ "Growing Against Violence – Points of Light". Points of Light. 30 August 2017. Retrieved 19 July 2018.
  72. ^ Jihadi Apprentice. ISBN 9781950806010.
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