 Before he died in June 2013 at 100 years of age, Rabbi Sidney Kleiman was both the longest-serving and oldest active congregational rabbi in the United States.Rabbi Kleiman served as the congregation's rabbi since 1939 until 1996, when Rabbi Gideon Shloush joined the synagogue and Rabbi Kleiman became rabbi emeritus.Adereth El's current membership reflects the diversity of its neighborhood, Murray Hill.