WStephan von Breuning was a German civil servant and librettist. He was Ludwig van Beethoven's lifelong friend, from his childhood in Bonn when receiving music lessons until acting as executor in Vienna.
WKarl Haffner (pseudonym), real name Karl Schlechter, was a German dramaturge.
WAndrea Heuser is a German writer, poet, translator and literary scholar.
WFelix Hollaender was a German writer, critic, dramaturge and theatre director. At one point he worked as a stage producer with his friend Max Reinhardt.
WGeorg Christian Lehms was a German poet and novelist who sometimes used the pen-name Pallidor. He published poetry, novels, libretti for operas, and the texts of cantatas.
WKarl Mickel was a German writer.
WIgnaz Schnitzer was an Austrian writer, journalist, translator, librettist and newspaper founder of Hungarian origin.
WLudwig Strecker Jr., also Ludwig Strecker der Jüngere, was a German music publisher, and an author of opera librettos which he wrote under the pen name Ludwig Andersen. He authored, and published through the Schott publishing house, two of the most successful German contemporary operas of the 1930s, Egk's Die Zaubergeige and Reutter's Doktor Johannes Faust.