Moussa is a senior economist in the Office of the Chief Economist for the Africa Region (AFRCE) at the World Bank. Before this position, he was an assistant professor of economics and international studies at the University of Oklahoma  from 2012-2015. Moussa is primarily an applied micro-economist interested in a range of issues in developing economies, mainly African countries. His research appeared in the Journal of Development Economics, the American Economic Journal: Applied Economics, the Journal of Africa Economies, the World Bank Economics Review, and World Development. Moussa served as the director of the Center for Research and Opinion Polls (CROP), a think tank in Togo he founded and led between 2011 and 2015. Moussa holds a PhD in economics from New York University and spent two years as a postdoctoral fellow at Stanford University's Institute for Economic Policy Research (SIEPR).