John Casella, managing director of Casella Wines, which has made a $57 million buyout offer for Peter Lehmann Wines, says he wants to ramp up production at the Barossa Valley winery and use the brands to quickly lift Casella's presence in the premium end of the market. Casella makes the hugely successful YellowTail brand that sells 12.5 million cases of wine annually around the world from its base in Griffith in NSW.