Gilles Bransbourg studied Economics, Mathematics and Statistics in Paris at Lycée Louis-Le-Grand, École Polytechnique, Sciences Po and École Nationale de la Statistique et de l'Administration Économique from 1983 to 1990. He became a market economist, then specialized in derivatives and structured products, and held various executive positions in the banking sector while teaching Economics at Sciences Po. In 2005, Bransbourg decided to focus on his true lifelong passion for History (he had won the French nationwide Concours Général award in History at the age of 17 in 1982), by completing a PhD at the École des Hautes Études en Sciences Sociales in Paris with Jean-Michel Carrié in 2010, Fiscalité et enjeux de pouvoir dans le monde romain.
He joined the Institute for the Study of the Ancient World in 2009 first as a Visiting Research Scholar and then Research Associate, and the American Numismatic Society in 2011 as an Adjunct Curator of Roman Coins, where his curatorial functions include the management of the Online Coins of the Roman Empire project. His research works deal with the economic and monetary aspects of the Greco-Roman Mediterranean world, with a comparative aim at other periods of history, notably focusing on the concept of fiat coinages. This led to the exhibition Signs of Inflation at The Federal Reserve Bank of New York between March and September 2012, the publication of “Les états de l’inflation” in Revue Numismatique 70, 2013, the two first parts of "Fides et Pecunia Numerata: The Roman Republic" and "The Currencies of the Republic" in the American Journal of Numismatics 23 and 25 (2011 and 2013) and a contribution to the Bulletin de la Société Française de Numismatique in 2014. Other publications include Rome and the Economic Integration of Empire, available through ISAW Papers.
Among several works to be released shortly are: "Currency Debasement and Public Debt Management at the Time of the Second Punic War', in Essays in Honor of R. Wistchonke, P. v. Alfen, M. Amandry, and G. Bransbourg (eds);The Later Roman Empire, in A. Monson and W. Scheidel (eds.), Fiscal Regimes and the Political Economy of Pre-modern States. His most recent contributions include Church and Economy in Late Antiquity in Ghent, March 27-28, 2014 ; 2013-2014 Columbia University Classics Colloquium, October 8, 2013; Colloque International, Bruxelles, September 5-6, 2013, Weights and Monetary Standards in Greece and Italy (2nd century BC - 1st century AD)and teaches for the Society’s Eric P. Newman Graduate Seminar in Numismatics. A member of the scientific and editorial committee for several academic journals, Bransbourg also co-authored a book commissioned by the French Prime Minister, La Politique Monétaire de l'Euro (2009) and has been lecturing since 2007 at the Executive Master of Finance of Sciences Po in Paris.