Johannes Mertens was born in Kufstein, Tirol. After his education, he went to work as a retoucher in a publishing house from Nürnberg. At the age of 20, he became a free lance artist and worked as a retoucher and advertsing artist. He also cooperated on the satircal magazine Simplicissimus. He is a caricaturist and portrett artist. In 1962, he drew some 'Fix und Foxi' stories for the Rolf Kauka studios.