Congregation Kehilath Jeshurun
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Congregation Kehilath Jeshurun (KJ or CKJ) is a Modern Orthodox synagogue, located on East 85th Street on the Upper East Side of the New York City borough of Manhattan. The synagogue was founded in 1872[1]. The synagogue is closely affiliated with the Ramaz School which shares a building with the lower school and is across the street from the middle school.
The name Ramaz derives from the initials of Rabbi Moses Zevulun Margolies (1851-1936), the grandfather-in-law of the school's founder, Rabbi Joseph H. Lookstein (1902-1979). The current Rabbi of the congregation, Rabbi Haskel Lookstein, is the son of Joseph Lookstein and was a member of the first class of six students at Ramaz when the school was established in 1937.