Hans Lengerer was in the government service (executive) until retirement. After contacts with the late Erich Gröner, he was encouraged by the late Jürgen Rohwer to publish on the IJN. He has written more than 50 articles and several books, including Die Flugzeugträger der Kaiserlichen Japanischen Marine und des Heeres, Band I. With Lars Ahlberg he privately publishes Contributions to the History of Imperial Japanese Warships. Lars Ahlberg is a retired army officer. Since his early youth he has been interested in naval history, and he is the coauthor of Taiho (Japanese aircraft carrier), Armourclad Fuso to Kongo Class Battle Cruisers, and Battleship Tosa Demolition Tests to the Modified Yamato Class, vols. I and III in the Capital Ships of the Imperial Japanese Navy 1868–1945 series.

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