Between the four of them, how many vintages have John Shafer of Shafer Vineyards, Boots Brounstein of Diamond Creek Vineyards, Margrit Biever Mondavi of Robert Mondavi Winery and Jim Barrett of Chateau Montelena seen in the Napa Valley? Let’s just say ‘a lot’. On February 24th 2011, this venerable quartet kept a rapt audience entertained with details of their experiences in the wine industry over the last fifty years. In this, the first of three instalments (Parts 2 and 3 are here and here), you’ll find the part boredom played in some of their decisions to move into the wine trade, and you might even discover the best place in Napa for skinny-dipping…