Grgich was a pioneer in the winemaking business.
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His Chateau Montelena chardonnay beat French wines in a blind tasting in 1976, helping turn Napa Valley into one of the world's premier wine regions.
He was also an integral supporter of the North Bay nonprofit Roots of Peace from the very beginning.
MORE: Bay Area nonprofit, winemaker turning Ukraine's minefields into vineyards
The group removes landmines worldwide, putting vines and other crops in their place.
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This picture is of Grgich with Roots of Peace founder Heidi Kuhn standing above him.
Grgich credited his longevity to his many friends and to a glass of wine a day.
He was 100 years old.