Question:
Which employer did Thomas Lengauer work for in Sep, 1986?

Context:
 Thomas Lengauer works for University of Paderborn from Jan, 1984 to Jan, 1992. 
 Thomas Lengauer works for Saarland University from Jan, 2001 to Dec, 2022. 
 Thomas Lengauer works for University of Bonn from Jan, 1992 to Jan, 2001.

Answer:
University of Paderborn