Originally from Baltimore, Maryland, Rabbi Muser studied in Yeshivas HaNegev in Israel and the Mirrer Yeshiva in Brooklyn. He joined the St. Louis Kollel in 1991. He currently serves as Mashgiach Ruchani for the Kollel, and in addition to his Kollel responsibilities, he has been serving as the Executive Director of Agudas Israel of St. Louis. He oversees the inspection of the Eruv to assure its halachic validity on a weekly basis, and is an instructor in halacha at Esther Miller Bais Yaakov of St. Louis. He and his wife, Chaya, have eight children and a growing number of grandchildren.