ben Naphtali was a rabbi and Masorete who flourished about 890-940, probably in Tiberias. Of his life little is known. His first name is in dispute. Some medieval authorities called him "Jacob"; two Tchufut-Kalè manuscripts have "Moses b. David"; a third contains his autoepigraph, which unfortunately is incomplete, only "ben David ben Naphtali" remaining.
Read more about Ben Naphtali: Ben Naphtali and Ben Asher, Relation of Both To Received Text, Jewish Encyclopedia Bibliography, Other Sources