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.

Justin Meyer was an American vintner, enologist, and member of the Christian Brothers. He was the founder along with Raymond Twomey Duncan of Silver Oak Cellars in 1972, a successful winery based in the Napa Valley and Alexander Valley. Today Duncan's sons David Duncan and Tim Duncan run Silver Oak Cellars, as well as Twomey Cellars, established in 1999. Meyer sold his share of the company to Duncan in 2001. One of California's top wine experts, he was president of the American Vineyard Foundation in the 1990s and also held numerous other positions in the wine industry. The San Francisco Chronicle cites Meyer as "one of the legends of the Napa Valley".