since become Chief Executive Officer of the RA. Bodies for interpreting Jewish law The Committee on Jewish Law and Standards (CJLS) is the movement's central body on interpreting Jewish law and custom; it was founded by the Rabbinical Assembly in 1927, with Max Drob as its first head. It presently composed of 25 Rabbis, who are voting members, and five laypeople, who do not vote but participate fully in deliberations. When any six (or more) members vote in favor of a position, that position becomes an official position of the Rabbinical Assembly. An individual rabbi, however, functions as the mara de-atra (מרא דאתרא, lit. "master of the house" in Aramaic, the local authority in Jewish law), adopting the position he or she considers most compelling, even if it has not been approved by the CJLS. The Rabbinical Assembly of Israel (the Israeli arm of the RA) has its own decision making body, the Va'ad Halacha. Responsa by both the CJLS and the Va'ad Halacha are equally valid, although the Va'ad's emphasis is on issues pertaining to Israeli society. The CJLS and the Va'ad do not always come up with the same answer to a question. Individual rabbis are free to decide which responsa to adopt or to develop their own halakhic positions. Publications The RA has also published prayer books for Shabbat and weekdays, most recently Siddur Sim Shalom and Or Hadash: A Commentary on Siddur Sim Shalom by Reuven Hammer. It has also published prayer books for Rosh Hashanah and Yom Kippur, most recently Mahzor Lev Shalem. The RA has also published liturgical texts for other days on the Jewish calendar, such as Megillat Hashoah: The Holocaust Scroll for Yom Ha-shoah and Siddur Tishah B’Av for the fast day of Tishah B’Av. In cooperation with the United Synagogue of Conservative Judaism and the Jewish Publication Society, the RA published the Etz Hayim Humash, a Torah commentary for synagogue use. In cooperation with the Jewish Theological Seminary of America, the RA also publishes a scholarly quarterly journal, Conservative Judaism, which is edited by Martin Samuel Cohen. Under its Aviv Press imprint, the RA publishes books on Jewish spirituality and contemporary Jewish practice written by its members. The earliest publications by Aviv Press were: a Torah commentary by Ismar Schorsch meditations on the Jewish year by Jonathan Wittenberg meditations on the psalms by Martin Samuel Cohen a volume describing different approaches