David Hargreaves studied history at Worcester College, Oxford, before becoming a history teacher, first at Stamford School in Lincolnshire, then from April 1986 at Westminster School in London, where he became head of the sixth form and a boarding housemaster. He taught at Westminster for a total of twenty-eight years until 2014. He now divides his time between running his education consultancy and writing, and is a governor of a London preparatory school. He publishes regular articles on history, including a weekly essay about the First World War published in centuryjournal.com. He lives in north London.