Which winery did Warren Winiarski begin his winemaking career with in 1964?

Warren Winiarski began his winemaking career at Souverain Winery in 1964. This winery, located in California, played a pivotal role in his development as a winemaker and his later success in the wine industry. Souverain was known for its high-quality wines, which honed Winiarski's skills and passion for winemaking. It was here that he gained valuable experience and knowledge about the grape-growing and winemaking process, which set the foundation for his future endeavors, most notably the establishment of Stag's Leap Wine Cellars.

While the other wineries mentioned have their own notable histories and contributions to the wine industry, they are not associated with the beginning of Winiarski's career in winemaking. Stag's Leap Wine Cellars, for instance, is the winery that Winiarski founded after his time at Souverain and garnered immense acclaim, especially after the 1976 Paris Wine Tasting. Rombauer Vineyards and Chareau Boswell are distinct entities with their unique stories that do not correlate with Winiarski’s entry into the winemaking field.