Silver Oak Cellars is a family-owned, California winery dedicated to producing only Cabernet Sauvignon. Silver Oak was established in 1972 by Ray Duncan and Justin Meyer. It is currently operated by Ray's sons David Duncan, who serves as the President and CEO, and his brother, Tim Duncan, who serves as Executive Vice President. Silver Oak has two wineries; one in Oakville in the Napa Valley and one in Healdsburg in the Alexander Valley. The Duncan Family also established Twomey Cellars in 1999, which has wineries in Calistoga and Healdsburg.

Raymond Twomey Duncan known as Ray Duncan was an American entrepreneur and vintner. Originally involved in oil entrepreneurship in Colorado and founder of Duncan Oil, he was the founder along with Justin Meyer of Silver Oak Cellars in 1972, a successful winery based in the Napa Valley and Alexander Valley. Today his sons David Duncan and Tim Duncan run Silver Oak Cellars, as well as Twomey Cellars. Duncan established the Durango Mountain "Purgatory" Ski Resort in 1965 and was chairman of the board for the ski industry organization Colorado Ski Country USA. He was inducted into the Colorado Ski and Snowboard Hall of Fame in 2006.