He and his brother David Miliband are both Labour MPs and both stood for the leadership of the party in 2010.
Miliband became a speechwriter and researcher for Shadow Chief Secretary to the Treasury Harriet Harman in 1993.
As a teenager, he reviewed films and plays on LBC Radio's Young London programme as one of its "Three O'Clock Reviewers", and worked as an intern to Tony Benn.
He was a violinist at school.
Likes "Desperate Housewives" and "Dallas".
He spent summer after his O-levels doing work experience with Tony Benn.
Is friends with Oona King since their days in Haverstock Comprehensive School.
Is friends with Mark Stears since his school days.
He once owned a pet hamster called 'Hammy'.
Aged 10 in 1978, a young Miliband won a Blue Peter badge and even appeared on the programme, reciting all of the British Prime Ministers since Sir Robert Walpole.
He lived in Boston at the age of 7 in 1975 where his dad is a lecturer in the USA.
He's involved in student activism during his days at Corpus Christi College at the University of Oxford.
As a teenager, his passions include computer games and puzzles.