David G. Howell is a Fellow of the American Association for the Advancement of Science and the Geological Society of America. He has been working with Napa Valley vintners for more than twenty-five years and is the co-author of The Winemaker’s Dance: Exploring Terroir in the Napa Valley. After retiring from the US Geological Survey, Howell was an adjunct professor in Stanford’s School of Earth, Energy & Environmental Sciences from 2005 to 2009. He received a PhD from UC Santa Barbara and has authored more than 150 scientific articles.