Lora Jones is a news correspondent for the British Broadcasting Corporation.
The UK's next chancellor is a long-time ally and political soulmate of the new prime minister.
Millions of people are looking to him for help with soaring winter energy bills as he takes over at a crucial time for the UK economy.
The country's future prospects will be affected by the decisions he makes in the coming days and weeks.
He will be supported by his new neighbor. Mr Kwarteng and Ms Truss are both slight social misfits, amiable geeks, and have strong views which are in tune with each other, according to one of their friends.
He is unlikely to be accused of lacking self-confidence. He is the first black Conservative cabinet minister and has a double first from Cambridge University. He was a winner of the University Challenge.
East London is where the baby was born.
Trinity College, Cambridge University, and Harvard University are where I received my education.
The family is married to a solicitor.
There is a parliamentary constituency inurrey.
The parents of Mr Kwarteng came to the UK in the 1960s to study.
He was born in East London in 1975.
When he was born on a Monday, he was given a traditional Ashanti first name by his father and mother. He joked with his parents that he had pulled them up on it, but they didn't say anything.
His mother was a lifelong Conservative and the Church was very important to her.
He was three years old when Margaret Thatcher became prime minister. He has described himself as a "pragmatic Thatcherite", after saying in the past that his mother was a big fan of Thatcher.
He graduated from Cambridge University with a double first in classics and history after winning a scholarship to the exclusive private school.
There is a well-known anecdote about the young Kwasi Kwarteng. The tutor, who had arrived late and hadn't conducted many of these interviews before, was reassured by the self-assured 17-year-old.
He was a member of the Cambridge team which won the University Challenge in 1995 and caused a stir when he swore after he buzzed in.
He wondered how much being good at quizzes mattered in real life.
He completed a PhD in economic history at Cambridge University after attending Harvard University on a Kennedy Scholarship.
During his second stint at the university, Tristram Hunt joked that his roommate was "quite ungovernable and dishevelled".
He was a financial analyst at JP Morgan in the City of London and a columnist for the Daily Telegraph.
He made his first attempt to become an MP in 2005, and said that politics was always something he was drawn to. He was the Conservative candidate in the general election, but lost. In 2008 there was a failed run for the London Assembly.
He became a member of the "class of 2010", a group of politicians who had never been to parliament. He joined Parliament at the same time as future colleagues Priti Patel and Sajid Javid.
He used the opportunity to criticize the former Labour government led by Gordon Brown and how it tackled the 2008 financial crisis in his first speech in the Commons.
He said that "wealth creation is the most important element in getting us out of this recession" and that they didn't accept any blame for what happened.
Despite being tipped to become the Conservatives' first black cabinet member, Mr Kwarteng spent eight years as a constituency MP before becoming a minister.
He used his spare time to write books on topics from Margaret Thatcher's last six months in office to the British Empire and its legacy.
He believes that the debate about Black Lives Matter and colonialism has a cartoon-like view of history, and that it is true on both sides.
The book Britannia Unchained was co-authored by Mr. Kwarteng. They claimed that the British are among the worst idlers in the world.
He has changed his mind about this view. It is very difficult to apply comments from five or six years ago because of the current situation, he said.
He became a junior minister in the Department for Exiting the European Union after backing Leave in the referendum.
After working for more than a year at the Department for Business, Energy and Industrial Strategy, he was promoted to minister.
It has been said that the ascent is a reward for his support of Boris Johnson.
His views on state intervention in industry have changed due to the realities of the Pandemic and the high cost of energy
He said at the Conservative party conference that making someone an energy minister is the best way to convert them from free marketeers to government workers.
He married a woman he had previously dated.
Mr Kwarteng has been focused on change and challenges recently.
To protect British consumers and businesses, the new top finance minister will need to decide how to balance these issues with tackling bills and boosting domestic energy sources.