After winning the Selby and Ainsty by-election, Mather, 25, becomes the youngest MP in the Commons.
Labour's Keir Mather has become the youngest MP in the House of Commons.
Mr Mather has previously worked as a parliamentary researcher for shadow health secretary Wes Streeting, and more recently as a senior public affairs adviser at the Confederation of British Industry . "There isn't much I love more than being down on the terraces, a place where people come together, where you're part of a community and you sing with one voice."After winning his seat in the North Yorkshire constituency, with a majority of 4,161, Mr Mather said he "understood the enormity of what has just happened".
Labour leader Keir Starmer said the new MP would be a "fantastic MP who'll deliver the fresh start that Selby and Ainsty deserves".
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