In the 1950s, Lalou Bize-Leroy began working for her father’s négociant business Maison Leroy, dedicating her time to studying the vineyards of Burgundy. During this period she developed an encyclopaedic knowledge of the region’s terroir. By 1971 she was the Presidente/Directrice of Maison Leroy, accompanying her father to meetings at Domaine de la Romanée Conti (DRC), an investment her father had made in the 1940s giving him fifty percent ownership of the winery. Three years later Madame Leroy was the co-manager of DRC, where she worked until 1992, raising the status of the domaine to its now astronomical level. However, for reasons that have garnered much speculation, Lalou left DRC and turned her attention solely to her own businesses: Domaine d’Auvenay, Domaine Leroy and the original Maison Leroy.