Rabbi Simchah Roth has been living in Israel since 1969. For several years he was the rabbi and resident lecturer of the WUJS Institute in Arad; then he and his family moved to another development town, Yeroĥam, where he became deeply involved in Israeli secondary education. Rabbi Roth now lives in Herzliya, where he has served as the Rav of Torat Ĥayim Masorti Congregation since 1989.

Rabbi Roth has also held several posts in the Rabbinical Assembly in Israel: he has served as a vice-president, a member of the Executive Committee, has chaired the Religious Services Bureau and has also served on the Va'ad Halakhah of RA-Israel. Also, he was the editor of the Masorti siddur Va'ani Tefillati.

Rabbi Roth is the head of the Bet Midrash Virtuali, an online venue for serious study in the religious climate of Masorti (Conservative) Judaism.

Rabbi Roth retired from the rabbinate of Torat Hayyim Congregation in July 2007.