Mechon Hadar works to revitalize community, prayer and study among young Jews. Rabbi Elie Kaunfer is director.

Jews for Judaism is an international organization that aims to help Jews strengthen their heritage and counter attempts to convert Jews to other religions. It has branches in several cities, including Baltimore and Los Angeles.

The Institute for Jewish Spirituality uses Torah study, prayer, mindfulness meditation, yoga and spiritual direction and retreats to nurture deeper spirituality among rabbis, cantors and lay people. It is based in New York City but now has a Northern California branch. Rabbi Lisa Goldstein, a Reform rabbi, is its executive director in New York.

The Goldring/Woldenberg Institute of Southern Jewish Life in Jackson, Miss., works to bring educational and rabbinic services to isolated Jews and Jewish communities in a 13-state Southern region. Macy B. Hart is president.

Edah is an organization of Modern Orthodox Jews who seek greater openness to the world than does traditional Orthodox Judaism. Edah was founded in 1997 and ceased formal operations in 2006, but its website continues to post useful contacts and information, including a lengthy list of speakers/experts and a library. Rabbi Saul J. Berman is director.

Clal, the National Jewish Center for Learning and Leadership, is a think tank dedicated to training Jewish leaders and enhancing spiritual and civic involvement in American life. Rabbi Irwin Kula is president.

Yeshiva University, based in Manhattan, is the flagship school of higher education in Orthodox Judaism in the United States. Yeshiva is identified with the Modern Orthodox movement.

The Reconstructionist Rabbinical College in Wyncote, Pa., ordains rabbis in the Reconstructionist tradition of Judaism. It ordains both men and women. A page for journalists lists experts by topic. Eileen Fisher is assistant vice president for communications.

Baltimore Hebrew Institute at Towson University offers undergraduate and graduate degrees in Jewish studies, Jewish education and Jewish communal service. Erika Schon is the director.