Léon studied oenology at Bordeaux University, where he was taught by Émile Peynaud, graduating in 1964.
He started an oenology laboratory at the Gironde Chamber of Agriculture with Jacques Blouin in 1967.
[3] He became a wine consultant, working for clients such as Château Biac in Bordeaux; from 2006 at Château d'Esclans in Provence for Sacha Lichine; at Opus One in Napa; as well as clients in Burgundy, Sancerre, Rioja, Chile, and Japan.
[2] He bought Château Les Trois Croix in Fronsac in 1995.
[3][2] His son Bertrand became technical director at d'Esclans in 2011, and also took over the management of Les Trois Croix.