Some yeshivas, such as Yeshivas Chafetz Chaim and Yeshivas Ner Yisroel in Baltimore, Maryland, may encourage their students to obtain "semichah" and mostly serve as rabbis who teach in other yeshivas or Hebrew day schools. Other yeshivas, such as Yeshiva Chaim Berlin (Brooklyn, New York) or the Mirrer Yeshiva (in Brooklyn and Jerusalem), do not have an official "semichah/rabbinical program" to train rabbis, but provide semichah on an "as needed" basis if and when one of their senior students is offered a rabbinical position but only with the approval of their "rosh yeshivas".