maître de chai
From The Oxford Companion to Spirits & Cocktails
, the French term for “cellarmaster,” is commonly used to refer to the person who oversees the aging and blending of brandies such as cognac and Armagnac. See aging; Armagnac; blending; cellarmaster; and cognac.See aging; Armagnac; blending; cellarmaster;, cognac.
This definition is from The Oxford Companion to Spirits & Cocktails, edited by David Wondrich (Editor-in-Chief) and Noah Rothbaum (Associate Editor).