The career of Hermann Joha has started at the end of the 1970s. Then he was a member of the car-artists "Hell Drivers" from London. When he returns to Germany in the begin of the 1980s he got famous as most wanted specialist for carstunts. He enlarges his offer by closely watching the stunt-making in the United States. In 1992 he founded Action Concept Film- and Stuntproductions. Nowadays the offer constits of for example "Bodystunts", "High Falls", special effects and helicopteractions.

Hermann has also founded the only stuntschool is Germany. This stuntschool in Düsseldorf educates puplis to the profession of stuntman or stuntwoman. A third of all pupils is namely a woman. The education lasts four years. With this is included a small acting-education, so that the stuntpeople also can act a little. In "Cobra 11" often play people of the stunteam little figurants-parts.

Hermann is the co-founder of "Alarm für Cobra 11". Together with the programme-director of RTL Television, Marc Conrad, he developed the format of "Cobra 11". Also he is the founder of "Der Clown". This action-movie, nowadays also broadcasted as a serie, is developed and made by himself. "Der Clown" is about a former police-cop who fights against the injustice. The pilot-movie of this serie was directed by Joha himslef and for this he got an important german television-award.