Porcelain

Karl Mayer was initially a partner in the company V. Mayer & Söhne founded by his grandfather and later an industrialist in Vienna. On 3 July 1890 he married Monika von Goldschmidt (1862–1908) and on 8 May 1891 their only son was born.

After his father's death in 1899, Heinrich Rothberger, who trained as a tailor and commercial manager, took over his textile company Jacob Rothberger and department store on Stephansplatz in Vienna together with his brothers Moritz and Alfred.