Katalin Franciska Rac is a historian and archivist who specializes in the modern history of Central European Jewry and their transnational connections. Lenny A. Ureña Valerio, associate director for program development in the Latin American and Iberian Institute at the University of New Mexico, is the author of Colonial Fantasies, Imperial Realities: Race Science and the Making of Polishness on the Fringes of the German Empire, 1840-1920.