Twomey Cellars has wineries in Calistoga and Healdsburg and vineyards in Napa Valley and in Russian River Valley. The winery was established in the late 1990s when brothers David and Tim Duncan purchased a vineyard in the Soda Canyon Ranch area of southeastern Napa Valley. The Duncan family owns Silver Oak Cellars and in 2000 they acquired a 9-acre vineyard in the Russian River Valley. Winemaker Daniel Baron worked in Pomerol and St.-Emilion before becoming a Napa Valley winemaker. Twomey produces Merlot, Pinot Noir and Sauvignon Blanc.