Later in his career he also worked with Yiddish, Hebrew, and Chinese, as well as Germanic languages, and he also was invested in the development of an International Auxiliary Language.
Kemudian dalam kariernya ia juga bekerja dengan Yiddish, Ibrani, dan Cina serta bahasa Jerman, dan ia juga diinvestasikan dalam pengembangan Auxiliary Bahasa Internasional.