In 1939 Schoonmaker joined a new division of the U.S. Army known as the Office of Strategic Services or O.S.S, where he was stationed in Spain. He received the Bronze Star for his work with the O.S.S. After the war, Alexis Lichine negotiated a full partnership with Schoonmaker, but the wine partnership ended bitterly. In 1946, after many months of trying to find a compromise that would work for both, Lichine went to work as the import-export manager for United Distillers of America.
Wine writings and marketing
Schoonmaker's importance was both as a writer, the author of the Complete Wine Book and later the classic Frank Schoonmaker's Encyclopedia of Wine, and as a wine importer, who found American markets especially for small scale growers in Burgundy such as Domaine Ponsot in Morey St Denis and the Marquis d'Angerville in Volnay. Together with Baudoin, Schoonmaker played a seminal role in creating a market for wines bottled by the grower/winemaker rather than by a negotiant' – a merchant/shipper. He started "Frank Schoonmaker Selections" in 1936 in New York City. In 1972 The 'Frank Schoonmaker Selections' company was purchased by a division of the Souverain wine conglomerate. It was owned by Pillsbury of Minneapolis, Minnesota. In 1974 the Souverain wineries and the Frank Schoonmaker Import wine business were sold to St. Helena's Freemark Abbey wine group, and was renamed Rutherford Hill Winery. The same year a group of 179 grape growers bought the Alexander Valley Souverain facility. It has since become the property ofFrancis Ford Coppola. The Frank Schoonmaker Selections division was liquidated in 1975.
Consulting work
As a consultant to such Californian wineries as Wente and Almaden, Schoonmaker introduced the idea of labeling wines using varietal names rather than semi-generic names borrowed from European regions. Schoonmaker claimed that "the more specific the name, the better the wine". While Schoonmaker was promoting the practice in California already around 1940, it did not become truly widespread until the late 1960s and early 1970s. Robert Mondavi was one of the first to label the majority of his wines by varietal names and was tireless in promoting the practice. This has become the standard in New World wine and some European producers are adopting the practice because of consumer demand.