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Who was Rabbi Mordecai Kaplan?

Learn about the founder of Reconstructionist Judaism on RRC's website.

View a searchable archive of Kaplan’s diaries from 1913–1972, collected by the library of the Jewish Theological Seminary. (On the left side of the page, type in “Kaplan Diaries” in the search box.)  These offer a window into his thoughts on 20th century Judaism and the development of the Reconstructionist movement.

This is the archival site for It is no longer updated.

For the new site, please visit