Jan Udo Holey, and often known by his pen name Jan van Helsing, is a controversial German author who embraces conspiracy theories involving subjects such as world domination plots by freemasons, Hitler's continuing survival in Antarctica following World War II, the structure of the earth as hollow, and others. His theories draw from sources such as The Protocols of the Elders of Zion.
His books Geheimgesellschaften and Geheimgesellschaften 2 have been banned in Germany, France and Switzerland for inciting anti-semitic hatred.
The majority of his books, such as Die Kinder des neuen Jahrtausends. Mediale Kinder verändern die Welt are non-political and deal exclusively with esoteric subjects.