Keir Mather

Keir Alexander Mather (born 1998) is a British Labour politician who serves as Assistant Government Whip. He is the Member of Parliament (MP) for Selby, formerly Selby and Ainsty, since the 2023 Selby and Ainsty by-election. At the time of his election, aged 25, Mather was the youngest MP.

Early life and education
Keir Mather was born in 1998 in Kingston upon Hull. He was named after Keir Hardie, the founder of the Labour Party. Mather grew up in Brough, East Riding of Yorkshire. His mother, Jill Tambaros (née Golding), is a supply teacher, and his father, Mick Mather, is a support worker. His father is also a Labour Party activist. Mather was a member of the Youth Parliament, and set up a Labour group for young people in Hull. He was educated "for a short time" at a private prep school, and then at state schools including South Hunsley School in Melton. His mother recalled, in 2023, that Mather was interested in politics as a schoolboy: "When he was 16, I was dropping him off at the office of every MP in Hull, ... He said 'I'm going to introduce myself to them'. I thought it was funny he was so determined to go and see all those MPs".

He then went to the University of Oxford, graduating with a first in History and Politics at Wadham College, before receiving a Master of Public Policy (MPP) degree at University College. According to Paul Martin, Mather's politics tutor at Oxford, Mather was specifically interested in New Labour and "had a lifelong interest" in its major figures. Intent on becoming an MP, Mather studied for the MPP at Oxford's Blavatnik School of Government as a Political Leadership Scholar in a scheme that was "open to applicants from the UK and Republic of Ireland who intend to run for public office". While a student at Oxford, he was an appointed official of the Oxford Union debating society as head of research, and was also a co-chair of the Oxford University Labour Club. Also whilst at Oxford, Mather worked as a researcher for The Times journalist and former Conservative MP Matthew Parris.

Early career
Mather worked as a public affairs adviser for the Confederation of British Industry for 18 months before entering Parliament and was a parliamentary researcher for Labour MP Wes Streeting from 2019 to 2020.

Parliamentary career
Mather was first elected to the House of Commons as MP for at the 2023 Selby and Ainsty by-election with a 46% share of the vote and a majority of 4,161 votes. The previous Conservative majority of 20,137 votes, by which resigning MP Nigel Adams won at the 2019 general election, was then the largest Labour had ever overturned at a by-election, as well as the largest swing for a Labour by-election candidate since the 1994 Dudley West by-election.

Aged 25 when elected, Mather became the youngest serving MP, known as the Baby of the House, succeeding Labour MP Nadia Whittome of, who is two years his senior; she was first elected in the 2019 general election at the age of 23. Upon his election, the Veterans' Affairs Minister Johnny Mercer said that parliament "mustn't become a repeat of The Inbetweeners". This was considered to be a derogatory remark towards Mather's age, which Mercer denied. Multiple Labour politicians, including party leader Sir Keir Starmer, criticised Mercer's comment. The Guardian noted that former UK Prime Ministers William Ewart Gladstone and Sir Winston Churchill first became MPs at the ages of 22 and 25 respectively.

Mather was sworn in as an MP on 4 September 2023, following the summer break, along with Sarah Dyke and Steve Tuckwell. Dyke, a Liberal Democrat, was elected for Somerton and Frome, and Tuckwell, from the Conservative Party, was elected for Uxbridge and South Ruislip in two by-elections held the same day as Mather's. In interviews with BBC News and The Press from the same month, Mather said his main priority as an MP was to support people affected by the cost of living crisis. Other priorities included addressing insufficient SEND provision, rural crime, anti-social behaviour, underpeforming NHS services, little public transport provision and supporting small businesses. Mather made his maiden speech on 16 October 2023, during a debate on Early Years Childcare.

Mather became a member of the Treasury Select Committee on 20 November 2023. On 26 March 2024, he was appointed to the opposition frontbench of Keir Starmer as an opposition whip.

After the Selby and Ainsty constituency was abolished, he became Labour candidate for Selby in the 2024 general election. He was elected at the election with 22,788 votes, a majority of 10,195.

Political views
Mather voted for Remain in the Brexit referendum. He does not support rejoining the European Union or holding a second referendum on the issue.

In 2023, Mather said he supported Labour leader Keir Starmer's policy of maintaining the two-child benefit cap, adding: "I think we're going to inherit an absolute economic mess from the Conservatives when we take power and we're going to have to make extremely difficult decisions once we do, and I support the Labour government in doing so."

On gender identity, Mather has said "a woman is like my mum or my stepsister, somebody who is born biologically a woman. But there is a very small minority of people who feel like they’ve been born into the wrong gender and they deserve respect and care." In 2018, during a debate at the Oxford Union, Mather allegedly called Germaine Greer "an abhorrent transphobe" for stating that transgender women were not women. He also said Greer had made "dehumanising and downright dangerous comments about transgender women". When asked if he wanted to renounce his statements about Greer as an MP in 2023, Mather said: "What I said is on the record. I really strongly disagree with her outlook and approach to the issue."

Personal life
Mather is gay. He supports the rugby league club Hull Kingston Rovers.