sentences:  It must also be borne in mind that the redactor failed to use various sources, such as the Midrash on the Ten Commandments and the Midrash on the Death of Aaron, and that he likewise ignored the Targumim and writings relating to esoteric doctrines, with the exception of the Otiyyot de-R. Akiba, to which he alludes in Genesis 1, § 1.The author cannot be determined with certainty.The title-page of the Venice edition ascribes the composition of the work to R. Simeon of Frankfort, "the chief of exegetes" ("rosh ha-darshanim"), and this was accepted by David Conforte and Azulai, who called him Simeon Ashkenazi of Frankfort.