Frank started his professional career at the Economist Intelligence Unit in London before moving to HM Treasury where he advised the government on European economic reforms, fiscal policy, and the sustainability of the public finances and social security systems. Frank also worked in the City of London at a pension insurance specialist and the International Monetary Fund, where he was involved in the Fund's Romania programme during the eurozone crisis. Until early 2020, Frank was a senior advisor at the Bank of England, where he specialised in country surveillance and international financial stability issues.