By taking the work and life of the historian of mathematics Heinrich Wieleitner as an example, this study aims to highlight the many interrelations between the historiography of mathematics, mathematics education, and science communication in mathematics.By integrating aspects of the history of media, this case study also explores mathematical public relations work in the 20th century and draws attention to the important persons, institutions and contents. The focus is on the Weimar period, in which the self-understanding of mathematics was challenged in different ways by far-reaching cultural debates. The article demonstrates that as a consequence of a changing media landscape, Weimar culture turned out to be a suitable environment for the successful self-presentation of mathematics.