In 1990, the Robert Mondavi family purchased Byron, and Ken Brown became Winemaker and General Manager. He and Tim Mondavi, Robert's son, set about designing the new Byron Winery as an expression of their shared belief in natural farming, experimental viticulture and gentle grape handling. They wanted to eliminate pumping, which shears grape stems, skin and seeds, allows tannins and other harsh elements into the juice and can make wine bitter.
With the aid of noted architect R. Scott Johnson, who designed the Opus One winery in Napa Valley and San Francisco's Transamerica building, Ken designed a multi-level winery that replaces pumping with gravity flow, resulting in more complex, dynamic wines. Byron's vineyards were also expanded and replanted as Ken Brown experimented with trellising systems, new rootstocks and clones, row orientation, and planting density in his quest for the perfect grape.