He was the secretary of the Esperantist Centra Oficejo and a member of the Lingva Komitato.
[2] The dowry of his wife, who was from a wealthy Parisian Jewish family, allowed him to quit the army and pursue his academic and civil passions.
He helped found the Ligue Des Droits De L'Homme, which had 200,000 members by the turn of the century.
In 1905, he and William T. Stearn founded the first Esperanto society in the United Kingdom.
[1] Moch, along with a small group of other French pacifists, purchased L'Indépendance Belge, a prominent daily newspaper from Brussels.