Musician, composer, guitar builder, journalist and author, among others of the bestseller “… und ich war nie in der Schule” (english: … and I never went to school), expert on free education, international referent, manager of the initiative “Männer für morgen”  (“Men for tomorrow”) together with Dr. Gerald Hüther.

His books are so far not available in English, but on youtube you find inspiring videos in English or with English subtitles, for instance:

https://www.youtube.com/watch?v=PCZ0yXbfQ8g

https://www.youtube.com/watch?v=pL261rAmrxY