Dr David Halpern is currently Chief Executive of the Behavioural Insights Team (BIT) and the UK's National Adviser on What Works. Prior to this, David was Chief Analyst in the Prime Minister’s Strategy Unit (2001–2007), and has held academic positions at the Universities of Cambridge, Oxford and Harvard. The work of BIT has led to numerous changes in government policy – from different ways of spending and saving money, to changes in regulation and legislation – and above all, to remarkable results.

A stunning book – thrilling, eye-opening and deeply informative