A German engineer and mathematician, the creator of format A4.
In his 1920 book Sprache und Schrift he advocated, for purely economic reasons, a "single alphabet" (all lower case) and envisioned the development of a universal typeface with which eventually all languages of the world could be written.  The idea of unicase typography was adopted by Bauhaus and proponents of the New Typography. Laszlo Moholy-Nagy read the book; Herbert Bayer designed a unicase font called Universal; Jan Tschichold made another.    
- Sprache und Schrift [Languages and Writing], 1920. (German)
- Markus Krajewski, Restlosigkeit. Weltprojekte um 1900, Frankfurt am Main: Fischer, 2006, pp 64-140. (German)