The Koren Mesorat HaRav Siddur is the first complete, Orthodox prayer book with commentary by the seminal scholar and leader, The Rav, Rabbi Joseph B. Soloveitchik. The Siddur presents Rabbi Soloveitchiks exceptional insights on prayer, which have been adapted from his writings, public lectures, and classes. It is complemented by an elegant presentation in the renowned tradition of Koren Publishers Jerusalem, and an eloquent English translation and introduction by the esteemed Rabbi Sir Jonathan Sacks. Published in cooperation with the Orthodox Union.