Started in the 20th century, Reconstructionism is the youngest of the four branches of organized American Judaism. A History section is under development on our website and will include links to information on Rabbi Mordecai M Kaplan, and Rabbi Ira Eisenstein.
For those wishing to learn more about Rabbi Mordecai Kaplan and his work, The Reconstructionist Press offers many books by Mordecai Kaplan and about him. The most recent publication is Communings of the Spirit: The Journals of Mordecai M Kaplan.