Justin is a senior fellow at CGD and co-director of CGD’s education programme. His research spans the economics of education and health, among other fields – including large-scale field experiments on topics such as outsourcing public schools in Liberia, scaling up successful education reforms with the Kenyan government, nationwide democratic deliberation on the use of natural resource revenues in Tanzania, and an evaluation of GAVI’s impact on vaccination rates in middle-income countries. Prior to joining CGD, he was a resident adviser to the Tanzanian government in Dar es Salaam and a research officer at Oxford’s Centre for the Study of African Economies. He has taught as a visiting professor at Georgetown’s Walsh School of Foreign Service, served as a consultant for the World Bank and various United Nations agencies, and as a member of the Millennium Challenge Corporation’s economic advisory council. He holds a doctorate in economics from Oxford University.