He also contributed to film magazines from all around the world, including the Spanish-language "" magazine from Argentina, where he had a monthly column for more than four years. In the 1960s, Ackerman organized the publication of an English translation in the U.S. of the German science fiction series "Perry Rhodan", the longest-running science fiction series in history. These were published by Ace Books from 1969 through 1977. Ackerman's German-speaking wife Wendayne ("Wendy") did most of the translation. The American books were issued with varying frequency from one to as many as four per month. Ackerman also used the paperback series to promote science fiction short stories, including his own on occasion. These "magabooks" or "bookazines" also included a film review section, known as "Scientifilm World", and letters from readers. The American series came to an end when the management of Ace changed, and the new management decided that the series was too juvenile for their taste. The last Ace issue was #118, which corresponded to German issue #126 as some of the Ace editions contained two of the German issues, and three of the German issues had been skipped. Ackerman later published translations of German issues #127 through #145 on his own under the Master Publications imprint. (The original German series continues today and passed issue #2800 in 2015.)