Rizhn-Boyan), and Rabbi Chaim Greineman. In Europe, as the Nazi armies continued to push to the east, the yeshiva students fled to (Japanese-controlled) Shanghai, China, where they remained until the end of the war. The story of the escape to the Far East of Mir Yeshiva, along with thousands of other Jewish refugees during WWII, thanks largely to visas issued by the Dutch consul Jan Zwartendijk and the Japanese consul-general to Lithuania, Chiune Sugihara, has been the subject of several books and movies including the PBS documentary Conspiracy of Kindness. After the war, most of the Jewish refugees from the Shanghai ghetto left for Palestine and the United States. Among them were survivors from the Mir Yeshiva, many of whom rejoined the yeshiva in Jerusalem. Rabbi Finkel's son, Rabbi Chaim Zev Finkel (commonly called Chazap), served as mashgiach. When Rabbi Eliezer Yehuda Finkel died on July 19, 1965, his son, Rabbi Beinish Finkel and his brother-in-law, Rabbi Chaim Leib Shmuelevitz became joint Mirrer Rosh Yeshivas. Reb Chaim was considered the main Rosh Yeshiva and when he died, his son-in-law, Rabbi Nachum Partzovitz, replaced him. Rabbi Beinish Finkel became Rosh Yeshiva after Reb Nachum died. With Rabbi Beinish Finkel's death in 1990, the reins were taken over by Rabbi Beinish Finkel's sons-in-law, with the Rosh Yeshiva, Rabbi Nosson Tzvi Finkel, at the helm. After Nosson Tzvi Finkel's sudden death on November 8, 2011, his eldest son, Rabbi Eliezer Yehuda Finkel, was named as his successor. Chaburas Under Rabbi Nosson Tzvi Finkel, the yeshiva's enrollment grew into the thousands. The large enrollment was divided into chaburas, or learning groups. Each chabura consists of the same type of student – e.g. American, European, Israeli, Hasidic, and non-Hasidic. These chaburas sit in designated areas in the Mir's various study halls (such as Beis Yishaya, Beis Shalom, and the Merkazei), as well as in the same area in the dining room. Each chabura is subdivided by shiur (class), with each maggid shiur (lecturer) teaching a group of students. The largest shiur in the yeshiva (which is also the biggest in the yeshiva world) is that of Rabbi Asher Arieli, who gives shiurim in Yiddish to approximately 700 students. In 2019 All Hasidic boys where transferred to a single study hall in the Pinsk Synagogue . Mir Brachfeld The yeshiva has a branch in Modi'in Illit primarily for Israelis, which also includes a kollel. Mir Brachfeld