Eliezer Segal is a professor of religious studies at the University of Calgary. He has a Web page explaining the “Varieties of Orthodox Judaism.” The page sets out the many branches of the movement.

Norma Baumel Joseph is an associate professor of religion at Concordia University in Montreal. She writes about the experience of women in Orthodox Judaism.

David A. Harris is executive director of the American Jewish Committee, a nonpartisan organization that conducts an annual survey of American Jews.

Tamar Ross is a professor of Jewish philosophy at Bar-Ilan University in Ramat Gan, Israel. She writes about Orthodoxy and feminism.

Daniel Frank is director of the Judaic studies program at Purdue University in West Lafayette, Ind.

Read a Feb. 11, 2009, CBS News story on Hasidic reggae singer Matisyahu.

Read an essay on the history of Orthodox Judaism in America adapted from the American Jewish Desk Reference: The Ultimate One Volume Reference to the Jewish Experience in America and posted at the MyJewishLearning.com Web site.

Read an essay by Michael Kress, editor in chief of MyJewishLearning.com, about the factions and tensions within the Orthodox movement.

Read a Nov. 27, 2012, article from The Jewish Week about how Orthodox Jews voted in the 2012 presidential election.