[1] His collective works consist of original dramas, poems, stories, textbooks and books about the Esperanto movement.
Having already learned Esperanto in childhood, Privat and fellow student Hector Hodler founded in 1903 the journal Juna Esperantisto (The Young Esperantist).
Though still an adolescent in 1905, he walked 600 kilometres to participate in the first World Congress of Esperanto in Boulogne-sur-Mer, France, where he spoke with mature eloquence.
[6] He presented Esperanto at the League of Nations, at the International Labour Organization (ILO) and at the Universal Telegraph Union.
He was a brilliant organizer, and arranged many international conferences about Esperanto instruction in Geneva (1922).