Entry in Blackwell Companion to Jewish Culture: from the Eighteenth Century to the Present (Blackwell Publishing: 1990), 402-3. Repr. in EMJC. vol. 1: 453. [Bibliography updated.] Rabbi, naturalistic theologian, and founder of the Reconstructionist movement. Kaplan was born in Svencianys, Lithuania, arriving with his family in the USA at the age of nine. He studied…