Nathan of Bratslav (January 22, 1780 – December 20, 1844), also known as Reb Noson, born Nathan Sternhartz in Nemyriv, was the chief disciple and scribe of Rebbe Naḥman of Bratslav, founder of the Bratslav stream of Ḥasidut. Reb Noson is credited with preserving, promoting and expanding the Breslov movement after the Rebbe's death. Rebbe Naḥman himself said, "Were it not for Reb Noson, not a page of my writings would have remained." (from his entry in Wikipedia)