In 1885, he published a German-language treatise about attempts at creating a world language from Leibniz to the present.

He began to work hard for the Esperanto movement despite attacks of his Volapükist colleagues.

Einstein wrote the first real textbook on Esperanto, in which he presented the language's correlative pronouns and adverbs in a table.

After Einstein's death, Zamenhof wrote that his name should be written in gold letters in the history of Esperanto.

On the 100th anniversary of Einstein's death, a plaque was hung in Nuremberg commemorating the house where he lived.