John Greenan

Lecturer in Criminology and Policing

Faculty:Faculty of Arts, Humanities and Social Sciences

School:Humanities and Social Sciences

Location: Cambridge

Areas of Expertise: Criminology , Policing

Courses taught: Criminology

John is a criminologist whose research interests lie in terrorism, extremism, radicalisation, penology and specifically studying conditions that influence extremism in the prison system.

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Email: [email protected]


John joined the criminology team at ARU in 2022, following a 16-year career in the Prison Service. As a former Prison Prevent Lead, John has proven knowledge and experience in counterterrorism and operational management. John completed his MSc in Counterterrorism at The University of Central Lancashire and is currently undertaking his PhD on conditions that influence Islamist radicalisation in UK prisons.

John is currently working with colleagues at the Policing Institute for the Eastern Region (PIER), examining the shift from vocal extremism to terror offending in the UK. This research hopes to shed light on a major gap in the literature concerning the mismatch between pre-offending and offending population within terror and terror related offences.

John teaches on a variety of modules across the criminology programme, focusing mainly on areas of counterterrorism, penology, and the criminal justice system.

Research interests

  • Terrorism
  • Extremism
  • Radicalisation
  • Penology
  • Criminal Justice System
  • Prisons and rehabilitation


John currently teaches on the following modules:

  • Policing and Counterterrorism
  • Crime News and Criminology
  • Criminology and Policing in Policy and Practice
  • Making a difference


  • PhD Criminology and Sociology, Royal Holloway University of London (in progress)
  • MSc Counterterrorism, University of Central Lancashire

Memberships, editorial boards

  • Research fellow for Conflict, Violence and Terrorism Research Centre, Royal Holloway University of London
  • Research fellow for the Prisons and Digital Technologies group, Royal Holloway University of London
  • Editor for