Career
He received the usual Talmudic education, and also acquired an extensive general knowledge of the profane sciences. In 1848 the government appointed him professor of Hebrew and Jewish history in the newly founded rabbinical school of Vilnius. Fuenn filled this position with great distinction till 1856, when he resigned.
The government then appointed him superintendent of the Jewish public schools in the district of Vilnius, in which he introduced instruction in the secular sciences and modern languages.
Fuenn also took an active part in the administration of the city and in its charitable institutions, and was for many years an alderman. In acknowledgment of his services the government awarded him two medals.