Leo is a Full Professor of Business and Economics at the Brussels School of Governance's Advanced Master in European Integration (EuroMaster) programme. He teaches courses in monetary economics, network economics, and e-commerce. His current research interests include currency usage, demand for e-money, and e-publishing. He has published extensively on these and other subjects in international journals as diverse as Journal of Money, Credit, and Banking; International Journal of Electronic Commerce; De Economist; Netnomics; Energy Economics; and European Journal of Operational Research. He is invited regularly as a guest speaker by central banks and payment providers.