Foto: JLU / Rolf K. Wegst

My research interests fall into the area of geometric group theory. That is, I study groups as coarse geometric objects. I am particularly interested in lattices on buildings, such as arithmetic groups and Kac-Moody groups. Other classes of groups I am interested in are relatives of Thompson's groups F, T and V and Artin groups. Many of these groups act on non-positively curved spaces, although often not cocompactly.

I am Heisenberg professor at JLU Gießen.

My former student Eduard Schesler did his PhD on Sigma-invariants of S-arithmetic subgroups of Borel groups.

ORCID: 0000-0002-3536-9938

arXiv: witzel_s_1

- at École Polytechnique as a Feodor-Lynen Fellow of the Humboldt Foundation.
- at Bielefeld University as a PostDoc,
- at University of Münster as a PostDoc,
- at TU Darmstadt as a (PhD-)student, and
- at Bordeaux University as an Erasmus student.

### Address

Mathematical Institute

Gießen University

Arndtstr. 2

D-35392 Gießen

Office: 5

Phone: +49 641 99 32080

Email: Stefan.Witzel [at] math.uni-giessen.de