Rav Chaim of Volozhin (1749-1821). The most prominent student of the Vilna Gaon, Rav Chaim established the Volozhin yeshiva in 1803, which was to become the classic model of Lithuanian yeshiva.
His most famous work was Nefesh Hachaim, in which he emphasizes the power of Torah study and fulfillment of mitzvos to bring a Jew close to G-d. He also authored Ruach Chaim, a commentary on Pirke Avos, and Nishmas Chaim, a collection of responsa.
Rav Moshe Horowitz, Bostoner Rebbe in New York
Rav Nissim Yagen (1940-1999). Born in Yerushalayim, Rav Nissim was the oldest son in a family of 14 children. When he was 20, he went to Lakewood to learn with Rav Aharon Kotler and Rav Shneur Kotler for 4 years. He married a year later. His first appointment was as rosh yeshiva of Yeshivas Ohel Moed. His first step in reaching out to the secular community was to organize a religious community in Givat Ada near Haifa on behalf of Yeshivas Ohr Somayach. He became the rav of the community which numbered 100 families. When he returned to Yerushalayim a few years later, he was appointed the mashgiach in Yeshivas Or Baruch in Bayit Vegan. It was during the 1973 Yom Kippur War that Rav Nissim resolved to dedicate his life to helping Jews return to Judaism; shortly after the war, he founded Arachim. He may truly be considered among the founding fathers of the Teshuva Movement. In 1979 he founded Kehilas Yaakov Kollel on Yosef Ben Matityahu Street for baalei teshuva which he continued to run until the end of his life.
Rav Elazar Menachem Mendel Biderman the Lelover Rebbe (2001)
Today in History – 14 Sivan
Massacre of the Jews of Frankfurt-am-Main, 1241.