Grand Rabbi Yitzhak Aharon Korff (legal name Ira A. Korff) is the Rebbe of Zvhil – Mezhbizh. Since 1975 he has been the Chaplain of the City of Boston (serving the Boston Police and Fire Departments, Mayor's Office, and other City departments and agencies) and spiritual leader of Congregation Bnai Jacob, Zvhil–Mezhbizh Beis Medrash of Boston, Miami, Florida, and Jerusalem, Israel. He is a dayan (judge of Jewish law) of the BaDaTz Boston Beth din (rabbinical court) and Vaad HaRabbonim (council of rabbis). He is also Consul General to the government of Austria and publisher of the Boston-based Jewish newspaper The Jewish Advocate.