Hélène Monastier
During the First World War, she became friends with Leonhard Ragaz and Clara Ragaz. In 1917, she met Pierre Ceresole . She worked closely with him until his death in 1945, participating in the creation of the Voluntary Civil Service which became the International Civil Service (SCI) . She is "the most active, the most assiduous and the most convinced of collaborators"  of the SCI.  In the 1940s she was its international president. She participated in the Vaumarcus camps (Center for meetings, training and vacations of the Christian Unions of young people). In 1932, she became a member of the Société des Amis, (Religious Society of Friends).