I think I spy Emmy Noether and Joseph Fourier.

On the wall are some of my friends -- people who have taught me good things. From the left - Felix Hausdorff (Who did so much for topology, and who took his life before being deported to a concentration camp) Gosta Mittag-Leffler (complex analysis) Alvin Turing (Computability) /below, hidden somewhat/ Tesla on a blue Serbian banknote, Newton, Stefan (of Stefan-Boltzman fame), Feynman/ Sofia Kovalevskaya (PDE's) Cahit Arf (on the Turkish 10 lyre bill - topologist) Emmy Noether (Rings & Fields) HSM Coxeter (Canadian geometer ... I met him when I was in High School!) Euler (on the Swiss 10 Franc banknote) Srinivasa Ramanujan Felix Klein Fourier and I'm resting on a Friden STW calculator that I've rebuilt.

Coxeter did amazing stuff in higher-dimensional geometry.

https://en.wikipedia.org/wiki/Harold_Scott_MacDonald_Coxeter

I have one of his books about polytopes and find it hard to wrap my head around the details, despite a childhood interest in higher dimensions. The diagrams are terrific!

Oh - up top is Bernhard Riemann and August Mobius

Thanks!