The Canadian arrives amid mounting expectation of a more activist stance towards monetary policy as the Bank looks to keep the UK recovery on track.
Hailed as the "outstanding central banker of his generation", Mr Carney arrives from the Bank of Canada, where he is credited with helping the Canadian economy recover faster from the downturn than any other developed major nation.
He takes office amid mounting signs of recovery in the economy but recent official figures revealed how far the UK has to go before returning to its pre-crisis conditions.
Widespread revisions by the Office for National Statistics meant that the double dip recession at the end of 2011 and first half of 2012 was erased from history. But revised data revealed the initial recession following the financial crisis was far worse than first feared, which means the economy is now even further behind its pre-crisis level.
GDP is now 3.9% lower than its peak in the first quarter of 2008 - previously it was estimated to be 2.6% below. One of Mr Carney's first tasks will be to chair the Monetary Policy Committee's monthly meeting as it gathers on Wednesday and Thursday to decide on interest rates.
She added: "The recent pick-up in the economic news has begged the question of whether Mr Carney actually needs to do anything any more. But the recent modest improvement is still far from the "escape velocity" he has said he wants to achieve."
More on Mr Carney's plans for monetary policy are expected from August onwards, with the possibility of introducing specific forward guidance on the cards as well as a further cash injection into the economy. His thoughts on the economy will be outlined when he makes his debut at the inflation report press conference on August 7 - his first major media appearance.
Mr Carney will be the first non-British citizen to govern the Bank of England in its 319-year history when he takes the helm. Hand-picked by Chancellor George Osborne to head the Old Lady, the 48-year-old will lead an institution now responsible for financial stability and keeping Britain's banks on an even keel - as well as its main task of monetary policy.