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 Sonoma Mountain AVA is an American Viticultural Area in Sonoma County, California, USA. It is centered on the Sonoma Mountain landform in the Sonoma Mountains. The appellation includes the town of Glen Ellen, California and is bordered on the west by the Sonoma Valley AVA. The area is known for the diverse micro-climates that occur within the crevices and folds of the hillside terrain and as such is home to production for a wide range of varietals including Cabernet Sauvignon, Chardonnay, Pinot Noir, Sauvignon Blanc, Semillon, and Zinfandel.