Sir Geoff Mulgan is Professor of Collective Intelligence, Public Policy and Social Innovation at University College London. Formerly he was chief executive of Nesta, and held government roles (1997–2004), including as the Prime Minister’s Strategy Unit director and as Downing Street’s head of policy. He is the founder or co-founder of many organisations, from Demos to Action for Happiness, and the author of Another World is Possible, Social Innovation: how societies find the power to change, Big Mind: how collective intelligence can change our world, and other books.

"The great thing about a complex society is there is space for lots of different kinds of people. There's space for wildly visionary poets and accountants and actuaries and engineers. And they all have a slightly different outlook, but it's the combination of this huge diversit ...