born May 24, 1810, Frankfurt am Main, Ger.
died Oct. 23, 1874, Berlin
German Jewish theologian.
He served as rabbi in Wiesbaden from 1832 and in Breslau 1838–63. He helped found a theological journal in 1835 and served as its editor. Geiger urged the need for simplified ritual, liturgy in one's native language, and emphasis on the prophetic writings as the core of Judaism , and he stressed the process of change and growth in Jewish religious consciousness, a basic idea in Reform Judaism .