Stewart Cellars was founded in 2000 by Michael and Anne Stewart of Houston, Texas. Michael founded Texas MicroSystems which he left in 1999 after merging the company with the Radisys Corporation. In 2000, the Stewarts bought a majority interest in Juliana Vineyards, a 3,400-acre property in the Pope Valley area of the Napa Valley. The winery focuses on Pinot Noir and Cabernet Sauvignon.