Kiefer started acting at ITS DNA (Preliminary Theater Training School) and studied at the Theater School ArtEZ in Arnhem.
He played in performances from theatre group DOX, in television series and short films, including the film ‘Kamp Holland’ from director Boris Paval Conen. He performed in the play ‘Ibuca’ from Theater Utrecht and ‘Watskeburt?! The musical from Bostheater productions and ‘Showponies’ I & II, a theatershow from Alex Klaasen.
Kiefer appeared in the tv series ‘Thuisfront’ earlier this year and he is currently filming for the television series ‘Goede Tijden, Slechte Tijden’.
The feature film ‘De Hoorzitting’ will air later this year.