Greywacke (pron. Greywacky) is the personal venture of Kevin Judd, one of Marlborough’s pioneer winemakers. He was the founding winemaker at Cloudy Bay, a pivotal role during which he directed the company’s first 25 vintages and putting Marlborough's Sauvignon Blanc in the minds of wine lovers and critics around the world.

In 2009 he established his own label, Greywacke, named after New Zealand’s prolific bedrock. Sourcing prime fruit from mature vineyards within the central Wairau and Southern Valleys, Kevin uses low-intervention winemaking to create wines hallmarked by their concentration and individuality. 

Alongside winemaking, Kevin has developed a parallel career in photography. For over two decades his evocative images have appeared in countless publications worldwide. His first book was the The Colour of Wine, a photographic essay on the vineyards of Marlborough. His second book The Landscape of New Zealand Wine was published in 2009 to considerable acclaim. His pictures now also adorn the front labels of the different wines produced by the estate.