Wolfgang Haddamitzky has worked in Olso and Tokyo on the staff of the German Cultural Institute (Goethe Institute) and as a librarian of the East Asia section of the Berlin State Library.
Mark Spahnhas a background in mathematics, engineering, and computer science. He worked for many years in Japan as a teacher, computer magazine writer, programmer, and translator. He currently lives in the United States, where he is active as a translator and consultant.
Wolfgang Haddamitzky and Mark Spahn are the authors of numerous language learning and reference books, including A Guide to Writing Kanji & Kana (Book II), Kanji & Kana: A Handbook of the Japanese Writing System, The Learners Kanji Dictionary and The Kanji Dictionary, all of which are available from the Tuttle Language Library.