Hans Rudi Erdt
Hans Rudi Erdt was a German graphic designer, lithographer and commercial artist known for his contributions to the Sachplakat movement created by Lucian Bernhard. His work at the prestigious Hollerbaum und Schmidt art printing company along with Edmund Edel, Hans Lindenstadt, Julius Klinger, Julius Gipkens, Paul Scheurich and Karl Schulpig make him one of the most important representatives of German poster art between 1906 and 1918. Erdt has also been recognized for his innovative use of typography in posters.
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Source: Wikipedia