I'm interested in the origins of Stag's Leap Wine Cellars. Can you find out who founded the winery and the year of their first vintage? Please provide both pieces of information as found on their website.
Navigate to stagsleapwinecellars.com. Hover over the 'Estate' link in the main navigation to reveal sub-links. Click on the 'Our Story' sub-link. Scroll down the 'Our Story' page to find the founder's name and the year of the first vintage. State the founder's full name and the year of the first vintage.
Successfully identify the full name of the founder as 'Warren Winiarski'. Successfully identify the year the first vintage was produced as '1973'. State both pieces of information clearly in the final answer.