David Miliband is a major figure in British politics who has served as a Labour MP and Foreign Secretary. His father, Ralph Miliband, was an influential Marxist intellectual. He began his career as a researcher for the left-leaning Institute for Public Policy Research before becoming a policy adviser to Tony Blair and head of the Number 10 Policy Unit in Blair’s Labour government. At this time he argued for adapting traditional social democratic principles to incorporate a more nuanced and strategic role for the state. He entered parliament in 2001, holding a range of posts in government before becoming the third youngest Foreign Secretary in history in 2007. In 2010 he lost the leadership of the Labour Party to his own brother Ed, before retiring from politics to become head of the International Rescue Committee in New York. He co-edited Reinventing the Left, which Polity published in 1994.