Jean-David Zeitoun is a physician, specialized in gastroenterology, also graduated from Sciences Po Paris. He holds a PhD from Paris University in clinical epidemiology. He has authored more than a hundred scientific articles, the half of which in international journals. In 2021 he published a book on the history of health improvement over the last 270 years (La Grande Extension, éditions Denoël). He also writes for several media, among which Le Monde or Les Echos. He lives in Paris.