Heinz Richter in German of course. He also wrote several introductory-level radio and electronics textbooks in Germany including Radio Praxis Fur Alle, Radioteknik Fur Alle, and Radiobastlen Fur Jungen. He held 10 patents of his own and was a frequent writer of trade articles. I can't read a word of the book, but I like the pictures. File this under radio Artifacts circa 1961.