The Park Avenue Synagogue – Agudat Yesharim (The Association of the Righteous) - is a Conservative Jewish congregation located at 50 East 87th Street on the Upper East Side of Manhattan, New York City. Founded in 1882, the congregation is one of the largest and most influential synagogues in the United States. As of October 2013, the synagogue is led by Senior Rabbi Elliot J. Cosgrove, PhD. In the past, the congregation has been led by such famous rabbis as Milton Steinberg and Judah Nadich.