Federico Ardila
San Francisco State University
Department of Mathematics
1600 Holloway Avenue - San Francisco, CA 94132 – USA
e-mail: federico@sfsu.edu
phone: +1 415 338 7720
He invited me to give a talk in the AMS session "Algebraic and Combinatorial Aspects of Polytopes".

Wolfram Koepf
Universität Kassel
Fachbereich 10 – Mathematik und Naturwissenschaften
Heinrich-Plett-Straße 40 - 34132 Kassel – Germany
e-mail: koepf@mathematik.uni-kassel.de
phone: +49 561 804 4245
He is the advisor of my habilitation supported by the Alexander von Humboldt Foundation at Universität Kassel.

Götz Pfeiffer
National University of Ireland, Galway
School of Mathematics, Statistics and Applied Mathematics
University Road - Galway – Ireland
e-mail: goetz.pfeiffer@nuigalway.ie
phone: +353 91 49 3591
He is the coauthor of the article "The Varchenko Determinant of a Coxeter Arrangement".

Gerhard Röhrle
Ruhr-Universität Bochum
Fakultät für Mathematik
Universitätsstraße 150 - 44780 Bochum – Germany
e-mail: gerhard.roehrle@rub.de
phone: +49 23432 28304
He supported me for the invitation by Research School at Ruhr-Universität Bochum and the Oberwolfach Leibniz fellowship.

Volkmar Welker
Philipps-Universität Marburg
Fachbereich Mathematik und Informatik
Hans-Meerwein-Straße - 35032 Marburg – Germany
e-mail: welker@mathematik.uni-marburg.de
phone: +49 6421 28 26611
He is the advisor of my doctoral studies funded by the DAAD at Philipps-Universität Marburg.