Prinzen was head coach of
Balzers and was assistant coach at
Vaduz in
Liechtenstein. He was normally the U–23 coach for
1. FC Nürnberg. He took over the U–23 team on 21 June 2013. However, during the
2013–14 season, he took over on an interim basis on 7 October 2013 when
Michael Wiesinger was sacked and on 23 April 2014 when
Gertjan Verbeek was sacked.
Valérien Ismaël succeeded Prinzen on 5 June 2014. ==Death==