Born in 1906 in New York City, Eisenstein was ordained by the Jewish Theological Seminary in 1931. In 1934, he married Judith Kaplan, the daughter of Mordecai Kaplan. Judith is most famous for being the first woman in the United States to have a Bat Mitzvah.
Studying at Columbia College and the Jewish Theological Seminary, Eisenstein became a disciple of Rabbi Kaplan. He was so influenced by his teachings, that upon his ordination from JTS, Eisenstein served as a rabbi at the Society for the Advancement of Judaism, a congregation which Kaplan had founded in 1922.
After leaving SAJ, Eisenstein moved to Chicago to work at Anshe Emet Synagogue, the first Conservative synagogue in the United States to form a Jewish day school. In 1959, sensing that his father-in-law’s philosophies needed more attention and organization, Eisenstein left Anshe Emet to focus his time on promoting Reconstructionist Judaism.
Rabbi Eisenstein became the head of the Reconstructionist Foundation and editor of the Reconstructionist, a magazine highlighting Reconstructionist philosophies and thoughts. However, the Reconstructionist “Movement,” as we know it today, did not exist. Mordecai Kaplan, for all his independent philosophies and views, felt uncomfortable breaking away from the Conservative Movement and the Jewish Theological Seminary, where he taught. He saw Reconstructionist Judaism as a philosophy of how American Judaism should function and improve itself, but not a separate movement outright.
Eisenstein, and others, disagreed with Kaplan. They viewed Reconstructionism as a distinct movement, and were frustrated that its leaders were being trained at Conservative and Reform rabbinical schools. Eventually, Kaplan gave permission for a Reconstructionist school to be formed. In 1968, the Reconstructionist Rabbinical College was founded in Philadelphia, Pennsylvania, with Rabbi Eisenstein serving as president.
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