The former Bank of England boss, Mark Carney, is now running for the Liberal leadership in his native Canada. What does his time in London tell us? Mark Carney was the first non-British person to become governor of the Bank of England in its more than 300-year history when he took the job in 2013.

OTTAWA—Mark Carney, the former Canadian and U.K. central banker, formally declared his interest in succeeding Justin Trudeau as leader of Canada’s Liberal Party and the country’s prime minister, promising an economic agenda focused on lifting it from a period of stagnant growth.

Carney worked for Goldman Sachs before joining the Canadian finance ministry in 2004. He was named Bank of Canada governor in 2007 and quickly had to deal with the after-effects o