Doumbouya began his winemaking career in 2007 as assistant winemaker at a premium Israeli producer while completing a biotechnology degree, working closely with Bordeaux consultant Michel Rolland. That early formation – rigorous, internationally oriented, steeped in the discipline of premium production – has never left him. Vintages in Argentina and Serbia, study trips to Italy, France, South Africa and Hungary, and two years at The Wine Group in Loxton preceded his arrival at Yalumba. In 2024, he graduated dux from the AWRI’s Advanced Wine Assessment Course. He judges at the Adelaide and Marananga wine shows and has served on the Barossa Wine Show committee for three years, a role that gives him unusual breadth of insight into the region. “With more than 700 wines entered each year, the show offers a valuable opportunity to see the breadth of styles being made across the region,” he says. “Tasting through those wines and observing the judging process provides great insight into the directions winemakers are exploring and the styles that are resonating most strongly.”
The Vat-11 Grenache began as a small-batch trial Doumbouya ran in 2022, exploring what grenache could do without malolactic fermentation – the process where sharper malic acid is converted to softer lactic acid, adding roundness and reducing freshness. Skipping it preserves the wine’s natural vibrancy in a way that is particularly valuable in warm vintages, when acidity can be hard won. “Grenache is incredibly versatile in this region,” he says. “It allows us to create wines across a range of styles and price points, from bright and approachable expressions through to more complex and structured wines. The warm, dry climate of the Barossa helps grenache achieve beautiful ripeness while still maintaining vibrancy.” The 2024 Vat-11 won the Trophy for Best Grenache at the 2025 Royal Queensland Awards, a significant affirmation for what had started as a trial and become a wine with a distinct identity within Yalumba’s portfolio.
The Virgilius is a different kind of responsibility – a wine that has long been regarded as Australia’s benchmark viognier, carrying decades of institutional knowledge and reputation. Doumbouya took it over after the 2023 vintage, working with Louisa Rose on the final blend before becoming fully responsible for all 2024 vintage decisions. The wine’s foundation is the Angaston vineyard at around 380 metres elevation in Eden Valley, planted in 1980 in old orchard country on soils the viognier loves for their fertility and structure. After hand-picking, the fruit is whole-bunch pressed directly to mature French oak puncheons – meaning entire grape clusters are pressed together without crushing – and fermented by wild yeasts. It then spends nine to ten months on full lees, with regular stirring to build the layered, textural complexity the variety is capable of at its best. “Viognier thrives in Eden Valley, particularly where the cooler conditions help retain freshness and build the layered texture the variety is known for,” says Doumbouya. A small portion of lees from the previous vintage – around one percent – is also incorporated, helping to build palate weight and maintain the consistent house style that has made the wine an institution.
The vineyard work behind The Virgilius has been an area of active focus. “As demand for our Virgilius Viognier has grown, we’ve focused significant attention on refining how the vineyard is managed, because ultimately better grapes lead to better wines,” he says. Pruning approaches have been refined to develop healthier, more balanced canopies – viognier in particular can struggle with poor canopy structure, and getting it right is essential for even ripening. Water use and under-vine weed management have been tightened. “The result is bunches that are better shaded and protected, which helps the fruit ripen more evenly and smoothly. In the winery, that translates to greater flavour development, better natural balance and the textural, expressive style we aim for in Virgilius. It’s a great example of how thoughtful vineyard work directly shapes the character and quality of the final wine.”
His broader winemaking philosophy – developed across five countries before landing in the Barossa – is built on restraint and attentiveness. “Our philosophy is very much that less is more – when the fruit is in great condition, there’s far less need for heavy intervention,” he says. “One of the simplest but most important rules is that the grapes need to be ripe, with great flavour, if you want to make a delicious wine in its intended style. Everything really starts in the vineyard.” The adrenaline of vintage, and the permanence of the decisions made within it, remain a primary motivator. “We only get one chance, once a year, to make great wine,” he says. “That sense of urgency and possibility creates a real energy through the winery, and being part of that process is something I still find very exciting.” Near-misses, he notes, happen almost daily during vintage, and maintaining vigilance is non-negotiable. “Earlier in my winemaking career I was probably a little more relaxed about some of those details, and that’s when things can go wrong. Over time you learn that success often comes down to being vigilant, asking the extra question, and making sure every decision is carefully considered.”
The ambition from here is refinement rather than expansion – working more deeply with the sub-regional differences between the Barossa Valley and Eden Valley, which he describes as analogous to the contrast between the Northern and Southern Rhône. “It’s less about expanding dramatically and more about specialising and refining – getting the very best out of our vineyards, our varieties, and our winemaking techniques, so the wines continue to reflect both place and our philosophy.” For a winemaker who has circled the globe twice before settling in South Australia, that focus feels like the point it was all building toward.
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