As a winemaker, Paul is highly regarded for his ability to identify exceptional vineyards, and for his pioneering spirit in working innovatively with new and historical sites and regions. His success has inspired a wealth of nicknames among the press, from quiet trendsetter to prospector to truffle-hunting dog. Initially hired by Robert Mondavi for his advanced understanding of oak aging, he was soon promoted to the inaugural Opus One winemaking team. Following his Mondavi experience, Paul joined Simi Winery as Winemaker before going on to consult for Peter Michael, Fisher Vineyards, Lewis Cellars, Bodegas Catena and others. Having founded Paul Hobbs Winery in 1991 and Vina Cobos in 1999, he continues to be a leading consultant winemaker around the globe.

The Russian River Valley AVA is an American Viticultural Area (AVA) in Sonoma County, California. Centered on the Russian River, the Russian River Valley AVA accounts for about one-sixth of the total planted vineyard acreage in Sonoma County. The appellation was granted AVA status in 1983 and enlarged in 2005. The area generally lies between Sebastopol and Santa Rosa in the south, and Forestville and Healdsburg in the north. The Russian River Valley has a characteristically cool climate, heavily affected by fog generated by the valley's proximity to the Pacific Ocean. The area is known for its success with cool climate varietals, notably Pinot Noir and Chardonnay.