Rabbi Mordechai Sher is the co-founder of Yeshivas Ohr Avraham. He is respected and admired as a committed Rebbe and counselor whose insights and presence have a profound impact on his students and the yeshiva. As a "father figure" to many students far from home, Rabbi Sher is always available to lend an ear, give advice and guide many a student through the shidduch process. His renowned mussar vaadim are a morning seder highlight. Originally from Pretoria, South Africa, Rabbi Sher studied law at Witswatersrand University. He continued his Torah studies at Ohr Sameach, Jerusalem as well as the Johannesburg Kollel. Before co-founding Ohr Avraham, he served as the Mashigiach of Yeshivas Midrash Shmuel in Jerusalem and directed the South African Program at Aish HaTorah. Rabbi Sher and his family currently live in Moshav Tifrach in the Negev.

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Rabbi Zelig Weinberg was born in Jerusalem and grew up and studied in the shadow of many Gedolei Yisrael of the previous generation. He spent his early years at Yeshivas Be'er Yaakov, under the guidance of HaRav Moshe Shmuel Shapira zt"l. He was soon invited to be among the first group of nine students in Yeshivas Brisk in Jerusalem where he was the youngest student ever to learn in the yeshiva. Rav Weinberg merited spending two years learning from the Brisker Rav zt"l before his passing, after which he spent many years as a close student of the Brisker Rav’s son Reb Yosef Ber Soleveitchik zt"l.

Among his chavrusas while in Brisk were Reb Avraham Gurwitz Shlita, the current Rosh Yeshiva of Gateshead, and Reb Chaim Shalom Leibowitz Shlita, the current Rosh Yeshiva of Kaminetz. After learning in Brisk for a number of years, he established his own kollel called Chedvas Yosef in Yerushalayim.

The Rav gave the top shiur at Aish HaTorah for some years, after which he travelled to London to help strengthen the kollel of his father-in-law, Rav Shmelke Pinter zt"l, the leader of the English chassidishe community. One year later found him back in Israel as the Rosh Yeshiva of the Slonim Yeshiva in Bnei Brak, headed by Rav Avraham Weinberg Shlita, the current Slonimer Rebbe. He began giving the top shiur in Ohr Avraham two years ago.

At Ohr Avraham, Rav Weinberg’s shiur presents our advanced students with an opportunity to blossom in the methods of learning which the Rav gleaned from his close contact with Gedolei Yisroel. He trains the students in this unique method of thinking, teaching them how to ask the important questions on the Gemara and the Mefarshim and how to go about answering them. Students present weekly chaburas, presentations of original ideas based on the material covered in the shiur.

In addition to his shiur at Ohr Avraham, Rav Weinberg continues to give a chabura to British students of the Mirrer Yeshiva during the evenings in his apartment. He is the author of Chevyon Oz, a two-volume work on the Rambam and Shas. The yeshiva is very fortunate to have Rav Weinberg on its staff.

Rabbi Avraham Wolitzky, originally hailing from Long Island, USA, has made a name for himself at Yeshivas Ohr Avraham with his endless energy and endearing wit that keeps his students on their toes during shiur. He gives the highly acclaimed Beginner's Talmud Shiur and spends time individually with students working on their skills.

A graduate of Yeshivas ITRI, Rabbi Wolitzky studied Jewish History at SUNY Albany. He also taught at Yeshivas Aish HaTorah for nearly two decades and is a trendsetter in introductory Talmud. Rabbi Wolitzky has trained nearly a thousand students, who are currently represented in some of the best yeshivos in the world. He currently resides with his family in Jerusalem.

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Rabbi Moshe Jacobson is an inspiring and dedicated teacher, who leads the popular upper level Talmud shiur. With his calm demeanor, he is beloved by his students who appreciate the precision, accuracy, and depth of his erudition and expertise. Rabbi Jacobson is a graduate of Yeshivas Mir, Jerusalem, where he studied for 12 years in close contact with the famed leaders of the yeshiva, particularly Rav Asher Arielli shlita. He now specializes in training in-depth Talmud and Jewish Philosophy and works closely with his students to pass on the understanding he imbibed from his mentors. Originally from Johannesburg, South Africa, Rabbi Jacobson currently lives in Modiin Elite with his family.

Rabbi Dovid Sipperwas born and raised in London, England. A graduate of Gateshead Yeshiva in England and Mir Yeshiva in Jerusalem, he is a sought after lecturer and author. As co-founder of Yeshivas Ohr Avraham, as well as Program Director, Rabbi Sipper is known and beloved as a caring and dedicated Rebbe. In addition to his much-anticipated daily bekiyus and Halacha shiurim, many students mark their calendars in anticipation of his weekly parsha shiur, a highlight at the Yeshiva.

Rabbi Sipper is actively involved in the personal and religious growth of his talmidim. Before co-founding Ohr Avraham, he was the Director of Intermediate Talmud at Yeshivas Aish HaTorah, Jerusalem. He developed the well received "To the Source" series of introductions to deriving halacha from the gemara and mefarshim. Rabbi Sipper has lectured nationwide for Discovery and is the author of the forthcoming book, "Sips From the Well" on the weekly parsha. In addition to his work at Ohr Avraham Rabbi Sipper also lectures at Beit Knesset Torani Leumi in Beit Shemesh. He lives with his family in Ramat Beit Shemesh.

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Rabbi Shmuli Mandelbaum, a product of Telz Yeshiva in Cleveland, made Aliyah 21 years ago. He attended Maarva as a bachur and from there moved on to Yeshiva Imrei Baruch in Telz Stone under the guidance of Reb Binyomin Sorotzkin. After marrying, Rabbi Mandelbaum spent some time in South Africa under Reb Baruch Grossnass Shlita, in Kollel Yad Shaul. Upon returning to Israel, he learned for the next seven years in Kollel Knesses Yehuda in Jerusalem, where he picked up his expertise in halacha. In addition to his work at Ohr Avraham, Rabbi Mandelbaum has given halacha shiurum at a yeshiva gedolah for "at risk" teens for the past three years. He is the yeshiva's "go to guy" when it comes to questions in halacha and his shiurim always elicit excitement and heated discussions. In addition to being the author of a best selling book on Hebrew Grammar entitled "Dikdukei Shai", Rabbi Mandelbaum is noted for his performances at talmidims' weddings, as well as being a noted baal tefilla.

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Dovid Friedlander moved from student to staff after taking on the position of Yeshiva Executive Director. A native New Yorker, he spent his early years at the Rabbi Teitz Yeshiva/Mesivta in Elizabeth, NJ. He earned his Bachelors degree from Yeshiva University, as well as an AA in Hebrew Studies. Dovid spent ten years in the Marketing and Advertising industries before coming on Aliyah with his family in 2005. Dovid learned in the Gra Baal HaBatim Kollel in Ramat Beit Shemesh for a year before discovering Ohr Avraham, the "best kept secret" in Beit Shemesh, where he has been ever since. Dovid and his family reside in Ramat Beit Shemesh and enjoy opening their home to the yeshiva's talmidim.