Where did Zinfandel originally come from?

Where did Zinfandel originally come from? Winemaker Marc Caparone talks about the origins of California’s signature grape, pointing to a document showing the arrival of vines called Zinfandel into Boston Harbor during the California Gold Rush. Caparone Winery grows Zinfandel in Paso Robles, California. Marc sat down with Ask a Winemaker at Red and White Wines in Chicago in 2013.