The "Pachad Yitzchok's" youngest son, Rabbi Mordechai Shlomo, remained in Vienna with his mother until the latter's death in 1922. At that point he considered an offer to head the Hasidic community of Drohobych in Western Ukraine, and another offer to lead an organized "chaburah" (group) of Boyaner Hasidim on the Lower East Side of New York City. He embarked on an 11-month pilot trip to America in December 1925, and then spent another year weighing the pros and cons of moving to America before acceding to the request of the Boyaner Hasidim of New York to establish his court with them. He and his family arrived in New York in November 1927.