Stefan BitterleStefan Bitterle has worked for many years as a writer and editor for radio, developing science and cultural programs for WDR and Deutschlandfunk. Along with travel and music, flying is another of Bitterle's many passions. A professional pilot and fliht instructor, he co-authored the book Junkers F13. The Return of a Legend, published by teNeues in 2015. When he is not on the road, Bitterle lives and works in Cologne. Read More Read Less