He was highly regarded as an orator in Esperanto, authored a number of books, and was the driving force behind the 1954 Montevideo Resolution in which UNESCO recognized Esperanto.
Известен как оратор на эсперанто, автор ряда книг и соавтор Резолюции Монтевидео от 1954 года, в которой ЮНЕСКО признал язык эсперанто.