As practical studies he worked in 1964–67 as an educator at Stella Matutina in Feldkirch, Austria followed by three years of theology studies at the university of Fourvière, Lyon, France and a fourth year at the University of Tübingen, among others from the professors Eberhard Jüngel, Jürgen Moltmann, Walter Kasper, Hans Küng; Licentiate work about Dietrich Bonhoeffer.
From 1976 he made regular education stays for Zen studies in Kamakura, Kamakura/Japan with Hugo Makibi Enomiya-Lassalle and Yamada Kôun Roshi.
In 1993 he positioned the educational institution Bad Schönbrunn new as a centre for spirituality and social consciousness and renamed it Lassalle-Haus.
Interfaith dialogue is not only conversation, but also the positive, constructive relations between persons and communities of other religions for their mutual enrichment.
[1] "To be religious today calls to be interreligious, not only bilaterally but multilaterally.“[1] Brantschen considers the dialog with Buddhism as an enriching, but not straight or concluded way between the East and West, which springs up in the suspense between real Zen-experience and imitation of Christ.