Throughout the 1970s his works were exhibited widely in one-man shows and collections. After a period as a visiting tutor at the Art School in Kassel, Germany, he abandoned teaching and took his first trip to Africa. In 1973 he began the "20 Sites n Years" photographic project. His first significant publication, "Works/Texts I", was published in 1975 by Hansjörg Mayer and his first retrospective exhibition toured Europe. This was also the year that he met Marvin and Ruth Sackner, who were to become his patrons and found an archive in Miami to house most of his work. The following year saw the completion of the privately printed edition of "A Humument", which had been published in ten sections since 1971.