Rabbi Yaakov Yitzchak Ruderman יעקב יצחק רודרמאן
Personal life
Born	(1900-03-16)March 16, 1900 Dawhinava, Russian Empire (now Belarus)
Died	July 11, 1987(1987-07-11) (aged 87) Baltimore, Maryland, U.S.
Spouse	Golda Feiga (née Kramer)
Children	1
Alma mater	Slabodka Yeshiva, Lithuania
Religious life
Religion	Judaism
Denomination	Orthodox Judaism
Jewish leader
Successor	Rabbi Shmuel Yaakov Weinberg

Yaakov Yitzchok Ruderman (1900^[1] – July 11, 1987)^[2] was a Russian-born American Talmudic scholar and rabbi who founded and served as rosh yeshiva (yeshiva head) of Yeshivas Ner Yisroel in Baltimore.

Ruderman was born to a Hasidic family of the Chabad denomination in Dawhinava, in the Vilna Governorate of the Russian Empire (present-day Belarus), where his father, Rabbi Yehuda Leib Ruderman,^[3] was the rabbi. He studied in Yeshivas Knesses Yisrael in Slabodka,^[1] under the "Alter", Rabbi Nosson Tzvi Finkel, and the rosh yeshiva, Rabbi Moshe Mordechai Epstein, receiving semicha from the latter in 1926.

During World War I, the Russian military authorities decided that Jews could not live close to the Kovno fortress, and they were banished from Slabodka by force. To everyone’s dismay a large number of Rebbeim and Yeshiva students were forcibly enlisted in the Tsarist Russian army. Rav Ruderman was among the students of the Yeshiva who were dispersed throughout. The Yeshiva was divided into two groups. A portion of the group, comprising the Alter of Slabodka, Rav Moshe Mordechai Epstein, and Rav Avraham Grodzinski, traveled to Kremenchug in the Poltava Province. Rav Ruderman joined this group.^[4]

While in Kremenchug, a group of gentiles abducted Rav Ruderman, holding him at gunpoint and demanding 10,000 rubles for his life. They took him to the home of the Rosh Yeshiva, Rav Moshe Mordechai Epstein, who had no money. As the kidnappers were about to kill Rav Ruderman, Rav Epstein ran outside, shouting to attract a crowd. Seeing a large group gathering, the thugs realized they had little chance of success and released Rav Ruderman unharmed. This was a story he often recounted for students at Ner Yisroel, years later.^[5]

In 1924, two years before receiving semikhah (ordination), Ruderman married Faiga Kramer from a rabbinical family.^[6][1]

In 1930, he joined his father-in-law, Rabbi Sheftel Kramer, at the latter's yeshiva in New Haven, Connecticut. In 1931, the Ruderman family moved to Cleveland, Ohio, along with the rest of the New Haven Yeshiva, where he continued to serve as one of its teachers.^[7]

In 1933, with his father-in-law's encouragement, Ruderman moved to Baltimore, where he was immediately offered a rabbinical post at Tiferes Yisroel Shul.^[1] Ruderman accepted the position on the condition that he be permitted to open a yeshiva using the synagogue's facilities. He began with six students and named the newly formed yeshiva Ner Yisroel (after Rabbi Yisrael Lipkin Salanter,^[8] the founder of the mussar movement).

The yeshiva grew quickly,^[1] and Ruderman approached the renowned Rabbi Shimon Schwab, at the time rabbi of another Baltimore congregation, and invited him to join the faculty. Rabbi Schwab taught the first-year shiur (class) in Ner Israel for several years, until he moved to Washington Heights. When Ruderman grew old, he became legally blind but could still read by holding a book within inches of his eyes that wore very thick glasses. He still held a siddur when davening. Ruderman led the yeshiva for 54 years until his death when Rabbi Shmuel Yaakov Weinberg, his son in law, took over.^[9] Ruderman was rosh yeshiva, while his brother-in-law, Rabbi Naftoli (Herman) Neuberger took care of the financial side. Together, they built it into one of the largest yeshivas in America, producing thousands of rabbis, educators and learned laymen.

Ruderman was also involved in many aspects of Jewish communal life outside of the Yeshiva. He was a member of the Council of Torah Sages of Agudath Israel and the chairman of the Rabbinic Advisory Board of Torah Umesorah.

Around 1926, Ruderman published his only written work; it was re-printed in 1930, Avodas Levi.^[10] The Sefer Avodath Levi Project to preserve his legacy has been in progress.^[11] Posthumously, his students have published several volumes of his teachings: ethical insights based on the weekly parsha named Sichos Levi, later re-written and republished as Sichos Avodas Levi, lectures on the 19th century work Minchas Chinuch and other Talmudic and halachic insights in Mas'as Levi, and lectures on Sukkah, Kiddushin, Kesubos, Bava Kamma, and Bava Metzia, as Shiurei Avodas Levi.

Ruderman's death on July 11, 1987, the 14th of Tammuz,^[2][3][12] followed less than 18 months after the deaths of Rabbis Yaakov Kaminetsky and Moshe Feinstein. Ruderman was one of the last surviving roshei yeshiva who came to America from Lithuania early in the 20th century.

His son-in-law, Rabbi Weinberg, who married his only child, Chana,^[1] succeeded him as rosh yeshiva of Ner Yisroel^[13] until Rabbi Weinberg's death in 1999.^[9]

Weinberg's wife, Chana, died on January 23, 2012.^[7][9]

Ruderman was buried in Baltimore's United Hebrew Cemetery.^[2]