John Martin McDonnell (born 8 September 1951) is a British Labour Party politician who was appointed the Shadow Chancellor of the Exchequer in September 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. McDonnell attempted to stand for the position of Labour Party leader following Tony Blair's resignation in 2007, but was unable to gain sufficient nominations. He was a candidate for party leadership again in 2010 following Gordon Brown's resignation after Labour's electoral defeat, but withdrew in favour of Diane Abbott, feeling that he would be unable to secure enough nominations.Following Jeremy Corbyn's election as Labour leader in 2015, he appointed McDonnell as his Shadow Chancellor. Alongside Corbyn, McDonnell has been seen as a key figure on the left-wing of the party. As Shadow Chancellor, McDonnell pledged to increase spending on infrastructure and research, describing his vision for the economy as "socialism with an iPad".