 He studied classical antiquities in Giessen, Göttingen, and Heidelberg, and then lived for several years at Paris as tutor in the house of Aaron Anselm Rothschild.Upon his return from Paris in 1842 Creizenach became teacher in the Jewish Philanthropin at Frankfort-on-the-Main, and was one of the principal founders of the Frankfort Jewish Reformverein; in 1854, however, he abandoned the faith of his fathers and embraced Christianity.Creizenach was made teacher of the Frankfort municipal high school in 1859, and appointed professor of history and literature at the Frankfort gymnasium in 1863.