Johann Korec grows up in institutions for homeless youths. After attending a school for retarded children, he works as a laborer at a farmstead. He is committed to Gugging mental hospital in 1958. Since 1981, he lives and works there in the House of Artists.
He had already begun working artistically in the 1960s. Based on copies of illustrations that appeared in newspapers, and over several years time, he develops an independent painting technique of his own. His ink and aquarelle pictures primarily depict loving couples and erotic scenes, which can be interpreted as an illustrated diary.