Christian Wolmar is a writer and broadcaster specialising in transport. He is the author of nearly 20 books including Are Trams Socialist, a critique of transport policy, and Driverless Cars: On a Road to Nowhere. His most recent book is The Crossrail Story. He also frequently appears on television, both as a pundit on news stories and as a historian on documentaries. He is a frequent speaker at conferences and has travelled extensively to give lectures including in India, Pakistan, USA and Australia.