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
(Lecturer for rhetoric and presentation, as well as vocal training)
eMail: stefan.keller@~@isr-rhetorik.de
private homepage: www.isr-rhetorik.de
