Principal Viticulturist Mark Greenspan, Ph.D. is an active author for wine industry publications. He has contributed a monthly column on timely viticultural topics to Wine Business Monthly continuously for over 12 years (almost 150 articles and counting!).
Additional references: (Provided based on timeliness)
Using the Leaf Porometer in Grapes – a reference for using this valuable water status measuring device.
Shoot Tip Indicators for Early – Season Water Status Assessment
Mark hosts a video on vineyard water management for the Sonoma Winegrape Commission, funded by a USDA RMA Grant: