Mørk graduated from The Danish National School of Theatre in 1987. During the period he was at the school he teamed up with Niels Olsen (who was also heard in Sandtrolden) and created the group Cirkus Montebello where the two could be seen entertaining in the streets of Copenhagen, earning a little extra during their studies. After they graduated, they toured around the country with Cirkus Montebello. Mørk quickly became known in theater circles but was less prominent in films. He is a versatile actor he have had many serious roles as well as comic roles in both theater and TV/movies.