Posek (Hebrew: פוסק [poˈsek], pl. Poskim, פוסקים) is the term in Jewish law for "decisor"—a legal scholar who decides the Halakha in cases of law where previous authorities are inconclusive or in those situations where no halakhic precedent exists.
The decision of a posek is known as a psak din or psak halakha ("ruling of law"; pl. piskei din, piskei halakha) or simply a "psak". In Hebrew, פסק is the root implying to "stop" or "cease"—the posek brings the process of legal debate to finality. Piskei din are generally recorded in the responsa literature.
Formulating a ruling (psak din)
In formulating a ruling, a posek will base the psak din on a careful analysis of the relevant underlying legal principles, as well as a careful study of the application of these principles. A Posek must therefore be thoroughly versed in rabbinic literature, especially the Babylonian Talmud.
The process of analysis usually entails today:
- an initial study of the relevant Talmudic Sugyas with commentaries;
- tracing the development of all related material in the Rishonim (Medieval rabbinic authorities prior to the Shulkhan Aruch) through the Arba'ah Turim and Shulkhan Arukh;
- and finally, a close analysis of the works of the Acharonim (rabbinic authorities from about the 16th century onwards) discussing the halakha as recorded in the literature of the Rishonim (and earlier Acharonim).
The ruling itself is an attempt to apply the precedents and principles of the Tradition to the question being asked. One common goal of poskim in this regard is, as far as possible, to be consistent with the codified law, as well as with the maximal relevant legal precedents, generally being decisions recorded in the responsa literature.
The role of the Posek
- In the Haredi world, each community will regard one of its poskim as its Posek HaDor ("Posek of the present Generation").
- Hasidic Jews rely on the Rov in their community (sometimes but not always Rebbes also get the position as Rov) or leading posek recommended by their Rebbe. Yet there are some Jews that are Hasidic but are not part of a specific movement these hassidim will vary in who they follow sometimes following generic hassid-style poskim like Rav Shmuel Wosner.
- Modern Orthodox Jews may select a posek on a more individual rather than a communal basis, although customs vary.
The approach taken here will, generally, be as above. Thus poskim will not overrule a specific law, unless based on an earlier authority: a posek will generally extend a law to new situations, but will not change the Halakhah; see further under Orthodox Judaism.
In 2014 the first ever book of halachic decisions written by women who were ordained to serve as poskim (Idit Bartov and Anat Novoselsky) was published. The women were ordained by the municipal chief rabbi of Efrat, Rabbi Shlomo Riskin, after completing Midreshet Lindenbaum women’s college’s five-year ordination course in advanced studies in Jewish law, as well as passing examinations equivalent to the rabbinate’s requirement for men.
Conservative Judaism approaches the idea of Posek, and Halakha in general, somewhat differently, and Poskim here apply a relatively lower weighting to precedent, and will thus frequently re-interpret (or even change) a law through a formal argument; see Conservative Halakha. Although there are some "poskim" in the Conservative movement - e.g. Rabbis Louis Ginzberg, David Golinkin, Joel Roth, and Elliot Dorff - the rulings of any one individual rabbi are considered less authoritative than a consensus ruling. Thus, the Conservative movement's Rabbinical Assembly maintains a Committee on Jewish Law and Standards, whose decisions are accepted as authoritative within the American Conservative movement. At the same time, every Conservative rabbi has the right as mara d'atra to interpret Jewish law for his own community, regardless of the responsa of the Law Committee.
Although Reform stresses the individual autonomy of its membership, it never completely abandoned the field of Responsa literature, if only to counter its rivals' demands. Even Classical Reformers such as Rabbi David Einhorn composed some. Rabbi Solomon Freehof, and his successor Rabbi Walter Jacob, attempted to create a concept of "Progressive Halacha", authoring numerous responsa based on a methodology laying great emphasis on current sensibilities and ethical ideals. Full text collections of Reform responsa are available on the website of the Central Conference of American Rabbis.
The Reconstructionist position is that if Jews would have formed cohesive communities again, their rulings would be binding, yet presently Judaism is in a "post-Halakhic state". Therefore, their basic policy is to allow tradition "a vote, not a veto" in communal and personal affairs.
List of poskim and major works
Poskim of past years
- Yoel Sirkis (1561–1640, Bach)
- Sabbatai ha-Kohen (1621–1662, Shach)
- David HaLevi Segal (1586–1667, Turei Zahav)
- Avraham Gombiner (c.1633–c.1683, Magen Avraham)
- Yechezkel Landau (1713–1793, Noda bi-Yehudah)
- Vilna Gaon (1720–1797, Gra)
- Shneur Zalman of Liadi (1745–1812, Shulchan Aruch ha-Rav)
- Avraham Danzig (1748–1820, Chayei Adam)
- Moses Sofer (1762–1839, Chasam Sofer)
- Menachem Mendel Schneersohn (1789–1866, Tzemach Tzedek)
- Shlomo Ganzfried (1804–1886, Kitzur Shulchan Aruch)
- Yitzchak Elchanan Spektor (1817-1896)
- Yechiel Michel Epstein (1829–1907, Aruch ha-Shulchan)
- Yoseph Chaim of Bagdad (1832–1909, Ben Ish Chai, Rav Pealim)
- Yisrael Meir Kagan (1838–1933, Mishnah Berurah, Chafetz Chaim)
- Abraham Isaac Kook (1865-1935)
- Yaakov Chaim Sofer (1870–1939, Kaf ha-Chaim)
- Chaim Ozer Grodzinski (1863–1940, Achiezer)
- Avraham Duber Kahana Shapiro (1870-1943)
- Avraham Yeshayahu Karelitz (1878–1953, Chazon Ish)
- Avraham Chaim Naeh (1890–1954 Ketzos ha-Shulchan, Shiurei Mikveh, Shiurei Torah)
- Yonasan Steif, (1877–1958)
- Aharon Kotler (1892-1962)
- Yechiel Yaakov Weinberg (1878–1966, Seridei Eish)
- Eliezer Silver (1882-1968)
- Yosef Eliyahu Henkin (1881–1973)
- Yehezkel Abramsky (1886–1976)
- Yoel Teitelbaum (1887–1979, Vayoel Moshe, Divrei Yoel)
- Yitzchok Hutner (1906-1980)
- Zvi Yehuda Kook (1891-1982)
- Yaakov Kamenetsky (1891-1986)
- Moshe Feinstein (1895–1986, Iggerot Moshe)
- Yitzchok Yaakov Weiss (1902–1989, Minchas Yitzchak)
- Joseph B. Soloveitchik (1903-1993)
- Shlomo Goren (1918-1994)
- Shlomo Zalman Auerbach (1910–1995, Minchat Shlomo)
- Pinhas Hirschprung (1912-1998)
- Hayim David HaLevi (1924-1998), Chief Rabbi of Tel Aviv, author of the set of halakha Mekor Hayim
- Chanoch Dov Padwa (1908–2000, Cheishev Ho'ephod)
- Chaim Kreiswirth (1918–2001)
- Ephraim Oshry (1914–2003)
- Baruch Ben Haim (1921-2005)
- Eliezer Waldenberg (1917–2006, Tzitz Eliezer)
- Avraham Shapira (c. 1914-2007)
- Meir Brandsdorfer (Kaneh Bosem) (1934–2009)
- Mordechai Eliyahu (1929–2010)
- Menashe Klein, (1924–2011, Ungvar Rebbe)
- Chaim Pinchas Scheinberg (1910–2012)
- Yosef Shalom Eliashiv (1910–2012)
- Ovadia Yosef (1920–2013, Yabbia Omer)
- Yisroel Belsky (1938–2016)
- Shmuel Wosner (Shevet HaLevi) (1913-2015)
- Aaron Lichtenstein (1933-2015), Rosh Yeshiva, Yeshivat Har Etzion in Alon Shvut
Conservative and Reform
- Jacob Zallel Lauterbach (1873–1942)
- Louis Ginzberg (1873–1953, The Responsa of Professor Louis Ginzberg)
- Isaac Klein (1905–1979, A Guide to Jewish Religious Practice)
- Jacob Agus (1911–1986, Dialogue and Tradition)
- Solomon Freehof (1892–1990, Reform Jewish Practice and its Rabbinic Background)
- Aharon Leib Shteinman (Circa 1913- )
- Fishel Hershkowitz, Klausenburger dayan in Williamsburg, Brooklyn, New York (1922- )
- Shmuel Kamenetsky, Rosh Yeshiva, Talmudical Yeshiva of Philadelphia (1924- )
- Gedalia Dov Schwartz, av beth din of Beth Din of America and the Chicago Rabbinical Council (1925- )
- Nissim Karelitz (1926- )
- Chaim Kanievsky (1928- )
- Nahum Rabinovitch, Rosh Yeshiva Yeshivat Birkat Moshe in Ma'ale Adumim, West Bank (1928- )
- Dovid Feinstein, rosh yeshiva at Mesivtha Tifereth Jerusalem (1929- )
- Zalman Nechemia Goldberg, Av Beit Din, Rosh haYeshiva of Machon Lev, editor-in-chief of the Encyclopedia Talmudit (1932- )
- Haim Drukman (1932- )
- Yitzchak Abadi (1933- )
- Dov Lior (1933- )
- Avigdor Nebenzahl (1935- )
- Zephaniah Drori (1937- )
- Yaakov Ariel (1937- )
- Zalman Baruch Melamed (1937- )
- Yisrael Ariel (1939- )
- Eliyahu Ben Haim (1940- )
- Hershel Schachter, rosh yeshiva at RIETS (1941- )
- Shlomo Aviner (1943- )
- Yehuda Henkin (1945- )
- Mordechai Willig, rosh yeshiva at RIETS (1947- )
- Yitzhak Yosef, Chief Sephardic Rabbi of the State of Israel, author of the set Yalkut Yosef (1952- )
- Osher Weiss (Minchas Osher) (1953- )
- Eliezer Melamed (1961- )
- Simcha Bunim Cohen, prolific author and pulpit rabbi in Lakewood, New Jersey
- Haham Pinchas Toledano, Hakham of the Spanish and Portuguese Jews of the Netherlands
- Yitzchak Berkovits, rosh kollel The Jerusalem Kollel
- Ephraim Padwa rav of Union of Orthodox Hebrew Congregations
- Zev Leff
- Walter Jacob, Liberal Judaism and Halakhah, Rodef Shalom Press, 1988. pp. 90-94.; Michael A. Meyer, Changing Attitudes of Liberal Judaism toward Halakhah and Minhag, Proceedings of the World Congress of Jewish Studies, 1993. See a collection of CCAR Responsa.
- Jonathan Sacks, Crisis and Covenant: Jewish Thought After the Holocaust, Manchester University Press, 1992. p. 158.
- N. S. Hecht et al., An Introduction to the History and Sources of Jewish Law, Oxford University Press.
- Louis Jacobs, A Tree of Life: Diversity, Creativity, and Flexibility in Jewish Law, second edition, Littman Library of Jewish Civilization, 1999.
- Mendell Lewittes, Jewish Law: An Introduction, Jason Aronson Inc., 1994.
- Authority and Autonomy in Pesikat HaHalacha at the Wayback Machine (archived February 20, 2009), archived from the 2004 original at nishmat.net
- An introduction to the system of Jewish Law, aish.com
- Jewish Law Research Guide, University of Miami Law Library
- Jewish Law: Examining Halacha, Jewish Issues and Secular Law (online journal)
- AskMoses.com, Live Answers