Mark’s experiences during a 1990 theatre tour through Siberia and Mongolia were the inspiration for his best received tragi-comical solo performance ‘Zoll’ (The Border). In Zoll Mark plays a lonely customs officer on the desolate border of an Eastern European dictatorial regime in the 1980’s, just before the fall of the Berlin Wall. Zoll’s direction and sound effects were done by Michael Helmerhorst. ‘Zoll’ performances traveled to Finland, Poland, Denmark, Belgium, Germany and the Netherlands.