I have been working at the  School of Computing and Information Systems at Grand Valley State University in Grand Rapids, Michigan since January of 2001 . I am an Associate Professor.

You can send your e-mail to the following address:
trefftzc at gvsu.edu

Regular mail can be sent to:

Christian Trefftz
C-2-110 MAK
1 Campus Drive
Allendale MI 49401
USA

My office phone number is: (616) 331 3646

Before coming to GVSU, I taught at the  Departamento de Informática y Sistemas at  Universidad EAFIT , in Medellín, Colombia.

References to my publications in the DBLP index can be found here.