Rabbi Aharon Feldman, the dean of the non-Hasidic Yeshiva Ner Yisrael: Ner Israel Rabbinical College in Baltimore, Maryland, wrote a widely-disseminated letter in 2004 which stated that Orthodox Jews should avoid praying in Chabad synagogues that avowed a belief in the Rebbe as the Messiah.
Berger is a highly popular figure in Modern Orthodox circles.