From 1838 to 1863 he lived in Breslau, where he organized the reform movement in Judaism and wrote some of his most important works, including Lehrand Lesebuch zur Sprache der Mischna (1845), Studien from Maimonides (1850), translation into German of the poems of Juda ha-Levi (1851), and Urschrift and Obersetzungen der Bibel in ihrer Abhangigkeit von der innern Entwickelung des Judentums (1857).
