Paul is a Professor of Security and Crime Science at University College London. His work focuses on the behavioural underpinnings of radicalisation and terrorism. His current work involves developing the evidence base for risk and protective factors for violent extremist outcomes, the development of measurements of violent extremism, the evaluation of risk assessment and management processes and countering insider threats. In the recent past, he has managed a projects from a range of funders including the European Research Council, NCITE, the Home Office, and CREST. Past projects focused upon various aspects of terrorist behavior including the IED development, terrorist network structures, lone-actor terrorism, insider threat, domestic abuse, and school shootings. His doctoral research focused on the underlying individual and organizational motivations behind suicide bombing. This piece of research won the Jean Blondel Prize for the best Ph.D. thesis in Political Science in Europe for 2010. He has published in leading psychology, criminology and political science journals and his latest co-edited book on violent extremism risk assessment and management is published with University College London Press. In the past couple of years, Gill has provided briefings at the White House, Quantico, Public Safety Canada, the Home Office, Norwegian Extremism Commission, Association of European Threat Assessment Professionals, Europol, and the Swedish Police amongst others. He won the 2024 Distinguished Achievement Award from the Association of Threat Assessment Professionals.