An expert in the field of oenology is known as an oenologist.
From the en.wikipedia.org
That's oenologist Philippe Cambie working his magic with grapes from some of Chateauneuf's finest vineyards.
From the latimes.com
Dominique Piron and his American oenologist wife, Kristine Mary, are nowadays crafting some of the more interesting, not to mention delicious, wines in Beaujolais.
From the businessweek.com
It's owned by the Manetti family, working in conjunction with renowned oenologist Franco Bernabei to produce this full-bodied, well structured and consummately stylish wine.
From the online.wsj.com
More examples
Enologist: a specialist in wine making
(oenology) enology: the art of wine making
Alternative spelling of enologist
(Oenology) Also known as Enology is the science and study of how to make wine. It is different from Viticulture which is the study of how to grow grapes and vines. When the grapes are used for winemaking, it is also known as Viniculture.