She worked, together with her husband, for the reconciliation between East and West parts of Europe in 50's. They were in Rome during the Council Vatican II lobbying for the recognition of the conscientious objection by the Roman Catholic Church. In the 60's and the 70s', they lived for sometimes and worked in South America, training groups in active nonviolence and helping for the creation of the SERPAJ, whose first coordinator was Adolfo Pérez Esquivel.
They also trained a lot of others groups in active nonviolence in many countries, in Europe, Asia, Middle East and Africa. They participated in the preparation of the People Power Revolution in Philippines in 1986.
^Richard Deats, Marked for life. The story of Hildegard Goss-Mayr, Hyde Park (NY), 2009 and Stephen Zunes, « The Origins of People Power in the Philippines », in Nonviolent Social Movements. A Geographical Perspective, Malden, 1999, p. 138.