I don't know much about Gero. He was one of the first artists I found online, back in 2008 when I started CGWTF. I remember googling "cgi + art" over and over to try and find some hidden software scene, frustrated that cgi was more synomymous with the Common Gateway Interface, and that search results for computer graphics would instead return the entire internet's /cgi urls. Needles, haystacks.
In hindsight there were plenty I missed, artists whose presence has only only increased in the last few years (Claudia Hart for example). But there are a few artists - found through those first searches - who belonged to a 90s early 2000s Alpine school of computer graphics experimentation - artists from France, Germany, Austria and Switzerland - who produced a lot of cinematic or architectural imagery. Many of them had really bad websites. I don't know the historical context for this movement (forward-thinking universities? state funding? design schools? Ars Electronica?) but Gero Gries seemed to me to be part of it.
Gero's work has such a delicate balance about it. It feels like unstyled CGI - devoid of all the deep grading and lens flare CGI gets covered up with. Each image is focussed on a certain native quality within rendering that isn't photographic. Maths and art can be a slightly dowdy genre, but in Gero's images they come together in such plain clarity. He also prefigured a very current trend toward CGI body distortion (see every fifth artist on FeltZine vaporwave). Take a look at Twist (below) from 2005, for example.