Yaacov Leiner was the son of R. Mordechai Yosef, the Ishbitzer Rebbe and author of Mei Shiloach. After his father’s death, he inherited the position of Hasidic Rebbe. His penetrating commentaries on the Torah and Festivals are characterized by a remarkable insight into the words of the Sages, and a profound sensitivity to the tension between spiritual aspiration and human frailty.