Director of successful documentaries since the early 1970s.
Father of Max von Thun
Father: Ernst Leopold Franz de Paula Maria Julian Graf von Thun und Hohenstein. Mother: Marie Therese Freiin Wiedersperger von Wiedersperg.
Good friends with actress Senta Berger.
Has two children with his first wife Yella: Gioia von Thun and actor Max von Thun.