Isaac Baer Levinsohn played a leading role in the Russian Haskalah and, accordingly, was called the "Russian Mendelssohn".
Portrait of Isaac Baer Levinsohn (1788–1860), 1913, unknown artist; source: Raisin, Jacob S.: The Haskalah Movement in Russia, Philadelphia 1913, p. 66. Digital Copy: Project Gutenberg, http://www.gutenberg.org/files/15921/15921-h/15921-h.htm.