Dr. Collen Lediga is an economist and researcher at the South African Revenue Service (SARS), where his work sits at the intersection of tax administration, revenue compliance, and fiscal policy. His research focuses on empirical public economics, domestic revenue mobilisation, and the design and monitoring of tax administration reforms in developing countries, with a particular emphasis on sub-Saharan Africa. He has provided policy advisory services to ministries of finance and revenue administrations across Africa in collaboration with institutions including the OECD, World Bank, African Union, ATAF, GIZ, and the Addis Tax Initiative. Dr. Lediga holds a PhD (Dr. rer. oec.) in Economics from Ruhr-Universität Bochum (Germany), an MSc in Public Policy and Management from SOAS, and a Bachelor of Arts in Tax Law and Honours in Demography and Population Studies from the University of the Witwatersrand, South Africa.