I'm a postdoc at the Faculty of Mathematics of Bielefeld University. Before I was a postdoc in Münster and a PhD student in Darmstadt.

My research interests fall into the area of geometric group theory, that is, I study groups using geometric and topological tools. Many of the groups I am interested in act on Bruhat-Tits buildings; this is the case for example for S-arithmetic groups. Another class of groups I have become interested in are relatives of Thompson's groups F, T and V. A common feature is that these groups act on CAT(0) spaces, although not cocompactly. I am particularly interested in finiteness properties of groups, which means that I try to find highly connected, cocompact spaces for the groups to act on.

My student Eduard Schesler works on Sigma-invariants of S-arithmetic subgroups of Borel groups.

### Address

Faculty of Mathematics

Bielefeld University

Postfach 100131

Universitätsstraße 25

D-33501 Bielefeld

Office: V4-204

Phone: +49 (521) 106 4986

Fax: +49 (521) 106 6480

Email: switzel [at] math.uni-bielefeld.de