In 1985, Jonathan interned in the Cognac region in France. After graduating from The University of California, Davis in 1987 with a Bachelor of Science degree in Fermentation Science with an emphasis in Enology, he worked a harvest at Stags Leap Wine Cellars. He then spent a year at Conn Creek Winery and Sebastiani Vineyards before joining Silverado Vineyards as a Lab Technician in 1990.
Jonathan soon moved into the position of Assistant Winemaker and became Associate Winemaker in 1997. He was named Winemaker one year later.
Jon is Past President of the Napa Valley Wine Tech Group and Past President of the Winemaking Techniques Committee of the California Enological Research Association. He is currently on the Board of The Trellis Alliance, an advisory committee to The University of California, Davis Viticulture and Enology Department