Case studies with a university student, a computer hacker, and a former drug dealer demonstrate different radicalisation experiences and suggest that radicalisation is not something done to people, but something produced by active participants. In this presentation Professor Kevin McDonald explores case studies of different radicalization experiences, based on interviews with members of banned organizations and the social media use of British and French young people who travelled to Syria. A Sydney Ideas event held at the University of Sydney on Tuesday 26 June 2018. https://sydney.edu.au/news-opinion/sydney-ideas/2018/radicalisation.html