[1] Weinberg trained as a civil servant, after graduating with a bachelor's degree in Law from the University of Paris and from the Institut d'Etudes Politiques de Paris.
He studied at the École nationale d'administration, the French School for Civil Service.
Weinberg started his career as a civil servant in the French administration (1976–81), before becoming « Chef de cabinet » (private principal secretary) to the Budget Minister (Laurent Fabius, 1981–82).
From 1995 to 2005, he was chairman of the management board of PPR, the largest non-food retailer in Europe and the third largest multi-brand luxury goods company in the world.
He is the chairman of Sanofi, a French pharmaceutical firm, known for its prescription products such as Lantus insulin.