Editing Eliyahu Yeichil-Simpson (section)

== Rabbi of Congregation Ahavas Achim ==
In the United States, he served as rabbi of Congregation Ahavas Achim Tzemach Tzedek in Boro Park for fifty years. Every Shabbos throughout his years as synagogue rabbi, he would recite a chassidic discourse by heart during Raava D'Raavim (the time of Shalosh Seudos).

At the beginning of 5684, the Rebbe Rayatz instructed three chassidim, including Rabbi Simpson, to organize the establishment of Agudas Chassidei Chabad. After additional letters and awakening activities from the three, in the month of Menachem Av 5684, Agudas Chassidei Chabad was established in the United States under the leadership of R' Moshe Eliezer Kramer and Rabbi Dovid Shifrin.

In 5685, R' Moshe Eliezer Kramer passed away and the leadership of Aguch was changed and expanded with several presidents appointed to Aguch, including Rabbi Simpson. In subsequent years there were changes in Aguch's leadership, and Rabbi Simpson was always a board member of Agudas Chassidei Chabad.