Spelling of his last name I doubt that his name could also be spelt Reinhold J st o umlaut instead of oe I m quite sure the only correct spelling is Joest for the following reasons Take a look at the CV Bio published on It s available both in English and in German language Although there are lots of umlauts in both versions of the text indicating that no technical issue prevented the author from using them the name is spelt Joest for exactly 15 times whereas J st appears not even a single time The name Joest in this spelling originates from Dutch and not from German e g see the medieval painter Jan Joest Therefore in this case German umlauts aren t appropriate Indeed the name also appears in its Germanized version J st But people are bearing it either or My personal knowledge I m a German and I m also bearing the last name Joest I d never spell it J st btw I m not affiliated to Reinhold Joest