A gift of Morris and Adele Bergreen in 2003, Vassar College Libraries' Albert Einstein collection documents a lesser-known aspect of Albert Einstein’s career: his social and political work in the United States and abroad, with special attention to Jewish affairs. The collection was formed by Einstein's friend and executor to his will, Otto Nathan, an economist and professor at several institutions of higher learning, including Vassar College. It is composed of correspondence between Einstein and Nathan, as well as letters from Einstein's wife, Elsa, to Nathan, some manuscripts, ephemera, and photographs of Einstein. A number of letters discuss the fate of Jews in Europe and other aspects of World War II. Others deal with Brandeis University, Jewish affairs in the United States, and personal matters.