Glass Mountain Quarry wines are the result of a joint venture between Paterno Imports and Mercian Corporation. Glass Mountain wines are produced by Markham Vineyards, the Napa-based winery, under the guidance of winemaker Michael Beaulac. The wines are medium-bodied, mild, smooth and ready-to-drink. Recently, the Ninth Annual Wine & Spirits Restaurant Poll named Glass Mountain one of the favorite by-the-glass pours in the nations leading restaurants.