John McDonnell MP has been the Shadow Chancellor of the Exchequer under Jeremy Corbyn's leadership since 2015. He has been the Member of Parliament (MP) for Hayes and Harlington since the 1997 general election. He has served as Chair of the Socialist Campaign Group in Parliament and the Labour Representation Committee, and was the chair of the Public Services Not Private Profit Group. He is also Parliamentary Convenor of the Trade Union Co-ordinating Group of eight left-wing trade unions representing over half a million workers.