Mordecai Kaplan
Mordecai Menahem Kaplan (June 11, 1881 – November 8, 1983), was a rabbi, essayist and Jewish educator and the co-founder of Reconstructionist Judaism along with his son-in-law Ira Eisenstein.
Read more about Mordecai Kaplan: Life and Work, Relationship With Orthodox Judaism, University Establishment, Kaplan's Theology