- Diplom in Mathematics with Computer Science as minor from the
RWTH Aachen,
1988;

for the Diplom thesis Endliche Körper in dem gruppentheoretischen Programmsystem GAP (compressed PostScript [205k] in German).

- PhD in Mathematics from the
Australian National University,
1994;

for the dissertation Central extensions of polycyclic groups (gzipped PostScript [270k] ).

- In November 2007 I took up a position at the Hesse Ministry of Science and Art.

- Computational group theory
- Theory and computational aspects of polycyclic groups, a GAP 4 package for computation with polycyclic groups is available.
- GAP: Groups, Algorithms and Programming

- ANU Nilpotent Quotient Algorithm
- GAP 4 package for computation with polycyclic groups
- ANU PQ Gap 4 Share Package

- The MacTutor History of Mathematics archive by John O'Connor and Edmund Robertson.
- The Group Pub Forum
- E.A. O'Brien maintains a BibTeX bibliography of references in algebra (200k) which is also available in gzipped form (40k).
- A PostScript file (262k) with a survey of Computational Group Theory by Akos Seress is available. A shorter version has been published in the Notices of the AMS.