Ira Eisenstein was an American rabbi who, along with his mentor and—through his marriage to Judith Kaplan—father-in-law, Rabbi Mordecai Kaplan, founded Reconstructionist Judaism over a period spanning the late 1920s through the 1940s. Reconstructionist Judaism formally became an independent denomination within Judaism with the foundation of the Reconstructionist Rabbinical College in 1968—for which Eisenstein served as founding president.

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