[2] While writing both grandiose and humble prose, his style is consistently imbued with a sense of humor, humility and love for all things living.

While working in this position, Katz founded the Green Post, a periodical which very quickly reached a circulation of over one million.

The financial success allowed Katz to establish himself as an independent writer, giving him the freedom to travel the world while writing of his experiences.

During the period between 1925 and his death, Katz published nearly thirty-five volumes, mostly personally written journalistic travel books.

In the late twenties, his five-book series Die Weite Weite Welt (The Wide, Wide World) emerged, including Ein Bummel um die Welt, Funkelnder Ferner Osten, Heitere Tage mit braunen Menschen, Schnapps Kokain und Lamas, Ernte (name translations below).