An oenologist is a qualified professional specialising in the science and technique of wine. They master all the processes of transforming grapes into wine: winemaking, ageing, blending, stabilisation and bottling. In France, the title of oenologist is a protected national qualification (Diplôme National d'Œnologue, DNO), awarded exclusively by accredited universities after a five-year course. It is one of the few professional titles in the wine field to benefit from legal protection.
The oenologist may work as an employee of a wine estate, négociant or cooperative, or as an independent consultant following several clients simultaneously. In this second case, they are sometimes called a "flying winemaker" — an iconic figure in the wine world who has contributed to raising quality across entire regions and spreading the best winemaking practices at an international scale.
Oenology as a scientific discipline was born in the 19th century thanks to the founding work of Louis Pasteur, who demonstrated in 1863 the role of micro-organisms in fermentation and wine diseases. His research laid the foundations of oenological microbiology and opened the way to a scientific approach to winemaking.
In France, the first oenological stations were created in the major wine regions at the end of the 19th century. Oenology teaching gradually structured itself, with the creation of the Institut d'Œnologie de Bordeaux in 1880, today the ISVV. The Diplôme National d'Œnologue was officially created by decree in 1955, establishing the regulatory framework of the profession.
In the 1980s-1990s, the consulting oenologist became a media figure. Personalities like Michel Rolland in Bordeaux embodied this new model of the globe-trotting oenologist advising dozens of estates worldwide, sometimes imposing a recognisable international style that inspired as much admiration as controversy.
The oenologist follows the complete cycle from vine to glass. Upstream, they collaborate with the agronomist to define the qualitative objectives of the harvest: optimal harvest date, maturity management, plot selection. During harvest and winemaking, they make crucial technical decisions: yeast selection, temperature management, maceration duration, wine care.
Blending is often considered the oenologist's par excellence creative act. By tasting dozens of separate lots, they compose the final wine in precise proportions, seeking the best balance between complexity, freshness, structure and ageing potential. This step requires both an exceptional gustatory memory and a clear vision of the sought style.
The monitoring of ageing and stabilisation occupies a large part of their time: racking control, barrel management, chemical and microbiological analysis follow-up, fining and filtration decisions. The oenologist must guarantee that each cuvée arrives in bottle in a state of perfect stability and at the best of its aromatic expression.
According to data from the Union des Oenologues de France (UOF):
Approximately 8,000 oenologists holding the DNO active in France — UOF, 2022
Approximately 35 universities worldwide award a recognised oenology qualification — OIV
Over 6,000 oenologists practise as independent consultants worldwide — UOF
The oenological consulting market represents over 300 million euros in France — UOF, 2022
Over 50 nationalities are represented among members of the International Union of Oenologists
Estate oenologist — employee of a property, responsible for all production, guardian of the house style
Consulting oenologist — independent, follows several clients, brings an external perspective and cross-cutting expertise
Négociant cellar master — manages ageing and blending of large commercial cuvées, significant volumes
Cooperative oenologist — works with contributions from many members, volume management and homogenisation
Laboratory oenologist — analyses, quality control, technical advice to laboratory clients
Sparkling wine specialist — Champagne, Cremant, Cava, Prosecco, traditional method and Charmat
Sweet wine specialist — Sauternes, Tokaj, Port, Banyuls, late harvest, botrytis
Spirits oenologist — Cognac, Armagnac, whisky, cellar master and blender
Natural wine oenologist — minimal interventions, without or low sulphites, indigenous yeasts
International oenologist — wine projects in emerging countries, know-how transfer
The oenologist faces the rise of the natural wine movement which questions certain conventional winemaking practices. Growing demand for wines produced without inputs, without added sulphites and with minimal technical interventions forces oenologists to rethink their approaches. The best adapt by developing expertise in non-interventionist winemaking, which actually requires even greater vigilance and know-how.
Adapting to climate change is a major technical challenge. Increasingly warm vintages produce very ripe grapes, rich in sugars and low in acidity, potentially giving heavy and alcoholic wines. The oenologist must find technical solutions to preserve freshness and balance: earlier harvests, acid management, cooler winemaking, blending with high-altitude lots.
Finally, the digitalisation of analysis and monitoring tools is transforming daily practice. Connected sensors, cellar management software and artificial intelligence tools for fermentation prediction enable oenologists to gain in precision and responsiveness. This digital evolution does not replace the palate and judgement of the oenologist, but considerably increases their intervention capabilities.
Michel Rolland Conseil — Pomerol, Bordeaux, France
Derenoncourt Consultants — Saint-Emilion, Bordeaux, France
Oenoteam — Bordeaux, Gironde, France
Pascal Chatonnet Conseil — Bordeaux, Gironde, France
ISVV Bordeaux — Villenave-d'Ornon, Gironde, France
OenoGroup International — Bordeaux, Gironde, France
Eric Boschetti Conseil — Champagne, France
Oenologie Alsace Conseil — Colmar, Alsace, France
Conseil Oenologique Rhone — Avignon, Vaucluse, France
Paul Hobbs Winemaking — Sebastopol, California, USA
Helen Turley Consulting — Sonoma, California, USA
Tony Jordan Wine Consulting — Yarra Valley, Australia
WineTech Oenology SA — Stellenbosch, South Africa
Ricardo Cotarella — Rome, Lazio, Italy
Alvaro Palacios — Priorat, Catalonia, Spain
Oenoteam Espana — Rioja, Spain
Matias Michelini — Mendoza, Argentina
WineWorks Oenology — Hawke's Bay, New Zealand
Boisset Oenologie Conseil — Nuits-Saint-Georges, Burgundy, France
Christophe Ollivier Conseil — Narbonne, Aude, France
Oenologie Languedoc Conseil — Beziers, Herault, France
Stephane Toutoundji Conseil — Montpellier, Herault, France
Kevin Mitchell MW — Clare Valley, South Australia, Australia
Tatiana Zakharova — Moscow, Russia
Oenologie Provence Conseil — Aix-en-Provence, France
Giacomo Tachis Legacy — Florence, Tuscany, Italy
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