I am a Full Professor at Télécom Paris, Institut Polytechnique de Paris, and a Visiting Professor at McGill University for the 2026–2027 academic year. I am based at the Center for Research in Economics and Statistics (CREST) and an Academic Fellow at the Institut Louis Bachelier.

My work uses large, granular datasets — card transactions, mobile phone data — to answer concrete questions about how people spend, move, and are affected by policy and events. Recent work has looked at how consumers shift their spending across regions and online versus offline, and how local businesses are affected by things like new cycling infrastructure, telework, consumption externalities, extreme weather events, and sports competitions.

I also study digital markets: who profits when consumer data is bought and sold and what that means for competition between firms, as well as how payment technology is reshaping how people pay — from the effect of debit cards on cash use to contactless payment and, looking ahead, central bank digital currencies and stablecoins.

Much of this work relies on methods I develop myself, including fast algorithms for analyzing very large datasets — one runs up to 7,000 times faster than existing approaches — with applications such as fraud detection.

I co-direct the Digital Finance Research Chair at Télécom Paris, in partnership with the Groupement des Cartes Bancaires CB, Caisse des Dépôts, INSEE, and Institut Louis Bachelier.