He has almost given up on politics.
Starmer comes from a Labour family, and was even named after the party's founder, Keir Hardie, in Surrey. He graduated in law from Leeds University, and completed his postgraduate studies at Oxford University.
The politician worked as a human rights lawyer. He was still a member of the Public Prosecution Service, even becoming the agency's director. In 2014, he was awarded the Order of Knighthood.
The following year he was elected to Parliament. As an MP, he was Labour's spokesman on immigration issues and also on Brexit. Starmer took over the leadership of the Labour Party in 2020.
Former leader Jeremy Corbyn was seen as more extreme. He resigned as leader after a heavy election defeat in 2019. Starmer is seen as a more centre-left politician than Corbyn.
In 2021, when Labour lost Hartlepool after decades, Starmer questioned whether he should continue in politics, according to Reuters news agency.
The defeat at Hartlepool was a blow to him, according to Keir Starmer: The Biography, and Starmer only continued in politics after being persuaded by his wife and advisers.
He has succeeded in changing the face of the Labour Party: Starmer has run the party with discipline and prevented MPs from making promises without a budget for it.
The politician also abandoned some of his ideas. For example, he became an advocate of nationalizing privileged services, such as water and electricity, but later began to advocate that private companies would have greater capacity to work to revive the economy.
He is now the leader of a party that could return to power and take over a country facing problems with public health services and a high cost of living.
Polls give the centre-left Labour Party, led by Keir Starmer, 410 seats in parliament.
“We can end the chaos, we can turn the page, we can start to rebuild the United Kingdom and change our country,” he said at the start of the campaign.