Stefan Keller, M.A.
(Lecturer for rhetoric and presentation, as well as vocal training)
eMail: stefan.keller@~@isr-rhetorik.de
private homepage: www.isr-rhetorik.de
![Schluesselkompetenz-3.jpg](/fileadmin/_processed_/e/f/csm_Schluesselkompetenz-3_5d9d319390.jpg)
(Lecturer for rhetoric and presentation, as well as vocal training)
eMail: stefan.keller@~@isr-rhetorik.de
private homepage: www.isr-rhetorik.de