Rabbi Tzvi Dov (Zvi Dov) Slanger (1934–2018) was a Budapest-born Holocaust survivor, an exceptional Talmudic scholar, and a prominent educator who served as a cornerstone of Torah learning in Baltimore, Maryland, for over five decades.

A devoted disciple of the great Lithuanian sage Rabbi Elazar Menachem Shach, Rabbi Slanger was known for bridging the fiery commitment of pre-war European Jewry with the unique needs of modern American students.

Survival and the "Kastner Train"

Born into a comfortable, deeply traditional textile-merchant family in Budapest, Hungary, young Tzvi Dov’s childhood was shattered when Nazi forces occupied Hungary in 1944.

At just 10 years old, he and his family managed to escape Europe via the famous "Kastner Train"—a highly controversial rescue operation negotiated between Jewish activist Rudolf Kastner and Nazi official Adolf Eichmann, trading nearly 1,700 Jewish lives for supplies. While the train was route-diverted to the Bergen-Belsen concentration camp, where Tzvi Dov spent eight grueling months, the family eventually reached freedom in Switzerland and subsequently immigrated to British Mandate Palestine.

This childhood trauma left a profound mark of Hakaras HaTov (gratitude) on his character. Family members noted that for the rest of his life, having lived through starvation, he treated a simple slice of bread or a blanket with profound respect.

Formative Years and Elite Mentorship

In Israel, he entirely committed himself to the yeshiva world, eventually becoming a trusted, close disciple of Rabbi Shach (the Rosh Yeshiva of Ponovezh). He also absorbed the spiritual teachings of other 20th-century luminaries such as Rabbi Elya Lopian, the Brisker Rav, and the Chazon Ish. This personal access allowed him to absorb the classic mesorah (tradition) and the refined character traits (middot) of the previous generation.

In 1959, he married Rebbetzin Chana Mandelbaum (who held a Ph.D. and became a leader in Jewish education herself), connecting him to an illustrious rabbinic line that included long-time study partners of Rabbi Shlomo Zalman Auerbach.

26 Years at Ner Israel

After relocating to the United States, Rabbi Slanger settled in Maryland and accepted a position at Yeshivas Ner Yisroel (Ner Israel Rabbinical College) in Baltimore in 1965.

For 26 years, he served as a highly popular Rebbe (lecturer) and Mashgiach (spiritual guide). He was revered by his students for his encyclopedic mastery of Talmudic commentators—such as the Maharsha, Pnei Yehoshua, and Rabbi Akiva Eger—and his ability to clarify complex legal topics.

Building a New Citadel at Age 65

In 1996, at an age when most people retire, Rabbi Slanger chose to undertake a massive new project. Seeing a distinct need for a more customized, classical European approach to yeshiva education in Baltimore, he founded the Bais HaMedrash & Mesivta of Baltimore.

• Humble Beginnings to a Country Club Campus: The school began with just 15 boys in a few borrowed synagogue classrooms. Through sheer determination, Rabbi Slanger eventually acquired and renovated a massive property—the former Summit Country Club in Pikesville—turning it into a state-of-the-art campus attracting elite students globally.

• Cultivating True Bnei Torah: Rabbi Slanger held incredibly high standards for his yeshiva. He strongly disliked the casual way American boys often approached meals, so he forbade students from waiting in buffet lines, ensuring food was served with dignity. He also famously banned casual couches from the study hall, fiercely believing that an authentic Torah student should sit upright to learn, and go to bed if they are too tired.

Character and Uncompromising Honesty

Two classic anecdotes beautifully define Rabbi Slanger's leadership style and rigorous commitment to truth:

1. Growing Side-Locks for a Student

While teaching, Rabbi Slanger noticed a student who wore long payis (traditional Chassidic side-locks) tucked behind his ears, and that some of the American boys were subtly teasing him for it. Rabbi Slanger, who did not grow up with that specific custom, pulled the boy aside and said, "If I also grow payis, they won't be able to make fun of you anymore." True to his word, he grew his side-locks long and tucked them behind his ears for the rest of his life to protect the dignity of a single student.

2. Discarding the Photoshopped Brochures

When the yeshiva was fundraising for its new campus, a well-meaning staff member created a gorgeous marketing brochure. To make it look complete, the designer digitally photoshopped the yeshiva's name onto a sign on the front of the building. When Rabbi Slanger saw it, he immediately ordered the thousands of printed brochures to be destroyed. He explained that since the sign did not physically exist yet, presenting the image as reality was a form of dishonesty (geneivat da'at).

Passing

Rabbi Slanger passed away suddenly on February 6, 2018 (21 Shevat 5778) at the age of 83 following a cardiac episode. He is remembered as a premier master educator who effectively rebuilt the classic, uncompromising spirit of European Torah scholarship right in the suburbs of Maryland.