He's the man who masterminded Labour's general election campaign, and now holds one of the most important positions in Downing Street.

Morgan McSweeney was recently appointed the prime minister's chief of staff, after Sue Gray quit the role. But what do we know about him?

Born in Macroom, County Cork, he moved to London aged 17. He soon joined the Labour party under Tony Blair, working in a junior role at their headquarters.

He rose through the ranks, forging a reputation as a skilled campaign strategist, and has been credited with being the brains behind this year's landslide victory.

Mark Coles speaks to the people who know him - from school friends back home in Ireland, to others who've worked with him.

Production team Producers: Bob Howard, Caroline Bayley, Ellie House, Natasha Fernandes Editor: Ben Mundy Sound: Neil Churchill Production Co-ordinators: Maria Ogundele