There seems to be enough basic info (such as where he was living at some key points in time) to be able to use some of the available genealogy sources, including newspaper searches for related articles. Probably not much in Mill Valley, but as you know, there are/were quite a few papers in Saint Louis. There are also immigration records, naturalization data, census records, military records, and lots more. It depends on what kind of information you're looking for. - Herb

If you search for a type designer always look at first at the Klingspor Museum. Hans Reichardt has made a pdf from most of them. See the link.
http://www.klingspor-museum.de/KlingsporKuenstler/Schriftdesigner/Schroe...

On the last page of the pdf also some references are listed you can probably find at a library like Columbia.
-Joep Pohlen