Leo Stein (writer)
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Leo Stein (born Leo Rosenstein in Lemberg, Poland on 25 March 1861, † 28 July 1921 in 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.
A selection of his works includes Die lustige Witwe (1905), Der Graf von Luxemburg (1909) and Die Csárdásfürstin (1915).