Education
Having chosen the rabbinical career, he studied under Chief Rabbi Abraham Bing at Würzburg, and under District Rabbi Samuel Egers at Brunswick. Herzfeld took his degree (Doctor of Philosophy) in 1836, and shortly after was called by Egers, who had become blind, as his assistant at Brunswick.
Career
In 1833 he went to the University of Berlin, at the same time completing his Talmudic studies with Rabbis Oettinger and Rosenstein, and with Leopold Zunz. In 1842 he succeeded his master as "Landesrabbiner," retaining that office until his death. In 1879 the Duke of Brunswick conferred upon him the title of professor
Herzfeld displayed great activity, both as rabbi and as writer
His historical works embody the results of painstaking research and show analytical power. With Ludwig Philippson he convoked the first rabbinical convention at Brunswick, where, as well as in the subsequent conventions at Frankfurt and Breslau, he advocated a moderate Reform, remaining himself a strict observer of the traditions.