Wilhelm "Utz" Utermann (3 December 1912 â 11 August 1991) was a German writer, journalist, screenwriter and film producer.
He used the following pseudonyms: William Utermann, William Roggersdorf and Mathias Racker. Utermann was a former editor of the Nazi Party's newspaper and had been a Nazi bestselling author.
As Wilhelm Roggersdorf, he edited Erich von Däniken's Chariots of the Gods? and extensively rewrote the book.
He was married to Clementine zu Castell-Rüdenhausen.