John O. Brennan: Staying Safe in a Turbulent World

John O Brennan, former director of the Central Intelligence Agency, delivers the 2017 Richard Dimbleby Lecture. During his directorship, he was responsible for leading and managing intelligence collection, analysis, covert action and counterintelligence. He uses his extensive experience to assess the future prospects of security, stability and disruption in this time of global turbulence and challenge. Introduced by Jonathan Dimbleby.