Leo Stein (writer)
Leo Stein, born Leo Rosenstein (25 March 1861, Lemberg – 28 July 1921, Vienna, Austria) was a playwright and librettist of operettas in the latter part of the 19th and early 20th centuries, including works adapted for a number of Broadway productions. Stein wrote libretti for Johann Strauss Jr, Franz Lehár, Emmerich Kálmán, and Oskar Nedbal. His collaboration with Viktor Léon contributed much to Lehár's success. A selection of his works includes "Wiener Blut" (1899), "Die lustige Witwe" (1905), "Der Graf von Luxemburg" (1909) and "Die Csárdásfürstin" (1915). Stein is buried at the Vienna Zentralfriedhof. Leo Stein