NPR has posted a timeline of significant developments in the debate from 1972 through 2012.

Joey Weisenberg is the creative director of the Hadar Center for Communal Jewish Music. He is a mandolin player who is bringing ancient Jewish nigunim, or wordless rabbinic hymns, back into synagogue music. He was named to Jewish Week’s “36 Under 36: The Next Wave of Jewish Innovators” (scroll down).

Daniel Sieradski is the founder of Jewschool, a blog that covers everything from politics to religion to art from a Jewish perspective. It has 50,000 readers and contributors from 80 countries. He was named to Jewish Week’s “36 Under 36: The Next Wave of Jewish Innovators.”

Rabbi Naomi Levy is the founder of Nashuva, a Jewish worship community in Los Angeles. Levy is widely credited with finding innovative and creative ways of engaging unaffiliated and disaffected Jews with their faith.

Isaac Jerusalmi is a professor emeritus of Bible and Semitic languages at Hebrew Union College in Cincinnati. He wrote the introduction to Stanford University’s digitized Ladino library.

Gloria Ascher is an associate professor of German at Tufts University in Medford, Mass., and the only American professor who offers regular college courses in modern Ladino.

Rosalie Kamelhar is a professor of Hebrew and Judaic studies and director of the Hebrew language program at New York University.

Gennady Estraikh is an associate professor of Yiddish studies at New York University. He is a contributor to a Yiddish-language section of The Forward that aims to engage young Jews in learning Yiddish.

The Dark Knight Rises is the final entry in the latest Batman series. A gunman opened fire in July 2012 at a Colorado cinema premiering The Dark Knight Rises movie.