Dr. Alfred Loewenberg (1902-1949), a Berliner by birth, was an author and bibliographer. He assembled a collection of modern German plays that included almost every production staged during a very creative period in the German theater, 1880-1930. The works cover several stylistic periods in playwriting beginning with Naturalism, a dominant style in the 1890s, followed by Impressionism and Expressionism in the 1920s. Noted writers of the period include Hugo von Hofmannsthal, Gerhart Hauptmann, Arthur Schnitzler, and Georg Kaiser. Dr. Loewenberg also collected plays in translation of European playwrights Tolstoy, Maeterlinck, Ibsen, and Strindberg who were known to have influenced the German authors.

Along with the play collection, Dr. Loewenberg assembled a large collection of articles from German newspapers that were related to the plays, the playwrights, or the business of theater. Reviews, criticisms, interviews, commentary, and other theatrical reports complement the play collection. Dr. Lowewnberg may have planned to compile a history of modern German drama, and the collection of contemporary journalism would have added to his research. After 1935, Dr. Loewenberg lived in London, and it is interesting to note that he did publish a bibliography of theater in Britain: The Theatre of the British Isles, excluding London: A Bibiography. (1950).

Alfred Loewenberg died in London in 1949.