The AC Golden Brewing Company is a subsidiary of MillerCoors, a joint venture between SABMiller and Molson Coors Brewing Company. Its purpose is to serve as a specialty brewing arm of MillerCoors, in the words of president Glenn Knippenberg, "Our mission for AC Golden is to be a brand incubator for what is now MillerCoors". The AC Golden Brewery operates in the former pilot brewery of the Coors Brewery. It debuted its first beer, Herman Joseph's Private Reserve, in 2008. The company began brewing its seasonal beer, a Vienna Style lager called Winterfest, in 2009. In April 2010, AC Golden introduced Colorado Native lager in Colorado, an amber lager made with 100% Colorado ingredients.