Who is Labour's Keir Starmer, the new leader of Britain?

LONDON — Britain elected its first Labour prime minister in 14 years, with a landslide victory for the opposition party during the July 4 elections.

Keir Starmer takes the country's top job from Rishi Sunak with projections suggesting his left-of-center party could have a majority of around 170 seats.

Starmer, 61, has had a rapid political ascent after entering U.K. parliament less than a decade ago. But many Britons still know little about the man who has positioned himself as the country's change candidate.

CNBC takes a look at the U.K.'s new prime minister and his platform.

Starmer was born in 1962 in London, England, to a father who worked as a toolmaker and a mother who worked as a nurse.

The 61-year-old has often referenced his modest beginnings as a point of connection with British voters and says his mother's lifelong battle with a severe illness gave him a deep gratitude for the National Health Service (NHS).

Starmer was the first in his family to go to university, studying law at the University of Leeds. After postgraduate studies at the University of Oxford, Starmer began working as a barrister — or British trial attorney — in 1987, taking on high-profile cases, including against Shell, McDonald's and former Conservative Prime Minister Margaret Thatcher's mine closures.

Starmer also served as a human rights adviser during former Labour Prime Minister Tony Blair's landmark Northern Ireland Good Friday Agreement.

In 2008, a year after marrying his wife, Victoria, Starmer became director of public prosecutions, putting him at the head of the U.K.'s Crown Prosecution Service.

Starmer was knighted in 2014 for his services to criminal justice and was elected to Parliament the following year, serving as immigration minister