Rabbi Rennert has been delivering a daily halacha shiur for many years, and he began delivering a weekly Iyun chabura following the petirah of his father, the Rosh Yeshiva zt”l. His eyes sparkle as he describes the essence of a Derech Chaim rebbi: “It is not an ‘approach’ to have such devotion to talmidim. The Derech Chaim rebbi genuinely cares so much that the talmid should succeed; his devotion is as natural as that of a father to son.”