Mosse was born in Grätz, Grand Duchy of Posen, as the son of Dr. Markus Mosse, a noted physician. He began his career as an apprentice in the book-printing establishment of Merzbach at Posen, publisher of the Ostdeutsche Zeitung, and mastered the technique of printing in Leipzig, Berlin, and other cities. Advertising was not at all developed in Germany at that time, and it was in this direction that Mosse at the age of twenty-four saw his opportunity. He organized an advertising agency at Berlin, which finally extended itself to most of the larger cities of Germany, Austria, and Switzerland. His success was phenomenal. It was through his initiative that advertising supplements were added to Kladderadatsch, Fliegende Blätter, Die Gartenlaube, Über Land und Meer, and other journals. Mosse is associated with the publication of the Berliner Tageblatt, the Deutsches Montagsblatt, the Deutsches Reichsblatt, the Berliner Morgenzeitung, the Allgemeine Zeitung des Judenthums, and the C.V.-Zeitung. Organ des Central-Vereins deutscher Staatsbürger jüdischen Glaubens. Among other publications of his were the Bäder Almanach and the Deutsches Reichsadressbuch. His printing establishment, founded in 1872, was one of the largest of its kind. Mosse was also known for his philanthropic work. In 1892 he established a fund for his employees with a capital of 100,000 marks, and in 1895 another fund of 1,000,000 marks for the same purpose. He built a hospital in his native town, Grätz, founded an educational institution for 100 children in Wilmersdorf near Berlin with an endowment of about 3,000,000 marks, aided in the foundation of the Emperor and Empress Frederick Hospital in Berlin, and contributed liberally toward various literary and artistic endeavors. He represented the Jewish community of Berlin for ten years, and represented the Reform congregation there from 1904. One of his six brothers, Emil Mosse, became his business partner in 1884, while another Albert Mosse, achieved prominence as a jurist. Mosse is buried in the Weissensee Cemetery, Berlin. After his death, his son-in-law, Hans Lachmann-Mosse, took over the management of the Mosse Group. Already during the hyperinflation of 1922/23, parts of the company assets were lost. In 1926 the publishing house got into serious financial difficulties. The previously assumed bankruptcy filing on September 13, 1932 could be revised by the latest research. In addition to the effects of the global Great Depression, a series of economic mistakes made by the management weakened the Mosse empire. The company was Aryanised shortly after the National Socialist takeover. The art collection from the estate of Rudolf Mosse was auctioned in May 1934 in Rudolph Lepke's Kunst-Auctions-Haus and in June 1934 in the auction house Union. Since March 1, 2017, the Mosse Art Research Initiative at Freie Universität Berlin has been researching the exact circumstances of the expropriation and the whereabouts of the individual works of art.
