国际世界语协会
He first served as vice-president, then as president (from 1912 to 1916) of the Esperanto Association of Britain. In 1908 he became president of the newly founded World Esperanto Association. Eduard Stettler nominated him "president since his birth", because of his great rhetorical ability. He was a member of the Lingva Komitato, the precursor to the current Akademio de Esperanto.