His research is on the macroeconomics of low-income countries, in particular those of Africa, with a focus on monetary economics and public finance; and growth and structural change in low-income countries.His work uses methods of quantitative macroeconomics including stochastic and deterministic general equilibrium techniques.
Christopher is Lead Academic for the International Growth Centre (IGC) programme in Tanzania. He is also a Visiting Scholar at the International Monetary Fund (IMF) as member of the DFID-IMF research program on the macroeconomics of low-income countries. From 2003-05 he served as external Macroeconomic Adviser to the Policy Division at the Department for International Development (DFID) and represented DFID as Vice Chair of the African Economic Research Consortium from 2006 to 2016. In 2011-12 he served as Special Advisor to the House of Lords Economic Affairs Committee Inquiry into Aid Effectiveness.
He is currently a co-editor of the Oxford Review of Economic Policy and an associate editor of the Journal of Development Economics and serves as a member of the editorial board of Oxford Economic Papers, Oxford Development Studies and the Tanzania Economic Review.