Born in Zvole, Moravia, graduated from dance conservatory in Ostrava. Within tce scope of military service worked with AUS (Military Artistical Ensemble) of Vít Nejedlý, then he joined Laterna Magika. He succeeded above all as a longtime impersonator of Cheerful Clown in Wonderful Circus, whome he played more than 2000 times. From other parts it was e.g. Harlequine in Love in the Carneval Colours, Storyteller in One Day in Prague, Wisard in Snow Queen, Aiolos in Ulysses etc.
At the same time he performed with Pantomime Na zábradlí under Ladislav Fialka as a mime and in Prague Chamber Ballet as a dancer.
As a choreographer, he cooperated vith Theatre of Petr Bezruč in Ostrava. After completing his career in the 90s, J.K. started to work at Laterna as a pedagogue and stage director. He devotes himself also to choreographical work (Children´s Opera Prague).