Alexander Boris de Pfeffel Johnson (born 19 June 1964) is a British politician, popular historian and journalist who has served as Mayor of London since 2008 and as Member of Parliament (MP) for Uxbridge and South Ruislip since 2015. Johnson previously served as the MP for Henley from 2001 until 2008. A member of the Conservative Party, Johnson considers himself a One Nation Conservative and has been described as a libertarian due to his association with both economically liberal and socially liberal policies.