[Update 26. July 2024]: The solution of the mystery didn’t work out , this Fritz Neumann (1928–2014) isn’t Ric
I’ve found two Fritz Neumann biographies and a change to the German Wikipedia:
Freundeskreis Bildende Kunst Oldenburg e.V.
By Dr. Arie Hartog of the Gerhard-Marcks-House Bremen:
askART
The full article requires a registration / subscription:
Wikipedia
There also has been a change to the German Wikipedia, adding the Ric pseudonym to Fritz Neumann. But there is still no article on him.
