Mordechai Dovid Unger (מרדכי דוד אונגער), disputed Grand Rabbi of the Bobov Hasidic movement, was born in 1954 to Grand Rabbi Yaakov Yitzchok Unger of Dombrov. He is a son-in-law of the late Grand Rabbi Naftali Zvi Halberstam of Bobov, the fourth Bobover Rebbe. Rabbi Mordechai Dovid is regarded by many as the Bobover Rebbe ( כ"ק אדמו"ר מבאבוב, שליט"א ).