Fürst Adolf zu Schwarzenberg was the oldest son of Jan Nepomuk Adolf Fürst zu Schwarzenberg (1860-1938) and Gräfin Therese von und zu Trauttmansdorff-Weinsberg (1870-1945). He was married to Prinzessin Hilda von Luxemburg (1897-1979) and was a brother of Ida and Anna Schwarzenberg. Alma Mahler knew the Schwarzenberg family from Vienna. Of the siblings, at least Adolf and Anna had emigrated to the U.S. Adolf was living in Vermont and working on a doctoral thesis about one of his ancestors, apparently at Columbia University. Father (Pater) Odo is mentioned as a mutual acquaintance.
From the description of Correspondence to Alma Mahler, 1944-1945. (University of Pennsylvania Library). WorldCat record id: 155864443
