Office: UHG, U4-241
Phone: +49 (0) 521 106-5025
E-Mail: Voll-XX-math.uni-bielefeld.de (replace -XX- by @)
Office hours: by appointment (via email)
Postal address:
Universität Bielefeld
Fakultät für Mathematik
Postfach 10 01 31
33501 Bielefeld, Germany