Yiddish and Esperanto

Claude Piron was a highly respected Swiss Esperanto speaker, guitarist, psychologist and UN translator. Later I discovered he had partial Jewish  roots. He wrote on the influence of Yiddish on the International Language.
http://claudepiron.free.fr/articlesenesperanto/jidainfluo.htm

Gary Shapiro, a journalist who came to several Language Rights events near the UN titled on "Esperanto, the World-wide Yiddish".
http://blogs.forward.com/the-arty-semite/134095/esperanto-the-worldwide-yiddish/