David Walker is deputy chair of Central and North West London NHS Foundation Trust and chair of Understanding Society, the UK household panel study. After a career in journalism with The Times, Guardian and BBC he became managing director, public reporting at the Audit Commission.

Until recently he was a member of the ethics and governance council at UK Biobank. His books include (with Polly Toynbee) Unjust Rewards, Cameron's Coup and Dismembered, how the attack on the state harms us all.