He was a Spanish rabbi and Kabbalist who is thought of as the composer or redactor of the Zohar. It is a matter of controversy if the Zohar is his own work, or that he committed traditions going back to Rabbi Shimon bar Yohai in writing.

To Moshe De Leon was also attributed Shaarei Tzedek (Gates of Righteousness), even if he probably was not its original author.

Shaarei Tzedek, Gates of Righteousness

Shaarei Tzedek, Gates of Righteousness   Buy now!
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Level: intermediate intermediate
As Moshe Idel demonstrated, this book is incorrectly attributed to Rabbi Shem Tov Sefardi de Leon. Its apparently true author is a direct disciple of Avraham Abulafia, Natan ben Saadyah Harar. He describes instructions he received from his teacher, believed to be Aubulafia himself, along with his ecstatic experiences. This gives the book unparalleled importance, as auto-biographical works in Kabbalah are extremely rare. Additionally, he explains in detail many kabbalistic techniques, the very ones he employed to reach his prophetical states. The full text is a reconstruction based upon the four original known manuscripts, which in general have some notable differences or omissions.