Question:
Which employer did Dirk Helbing work for in Nov, 2003?

Context:
 Dirk Helbing works for TU Dresden from Jan, 2000 to Jan, 2007. 
 Dirk Helbing works for University of Stuttgart from Jan, 1992 to Jan, 1999. 
 Dirk Helbing works for ETH Zürich from Jan, 2007 to Dec, 2022.

Answer:
TU Dresden