Repent America is a Philadelphia-based evangelistic organization that works against homosexuality, abortion and evolution.

Pam Kanaly and Shelley Pulliam are co-founders of Arise Ministries, a nonprofit, nondenominational women’s ministry based in Edmond, Okla., that holds annual conference retreats for single mothers.

David King is a senior lecturer in public policy at Harvard University in Cambridge, Mass.

Bike & Brunch is a Jewish, largely single bicycling group in the Baltimore-Washington, D.C., region.

Janet Porter is the president and founder of Faith2Action, a Christian advocacy group that works to influence politics and legislation. The group is based in Dania Beach, Fla.

J.J. Adler directed the 2007 documentary Unattached, about single Orthodox Jews in New York City. Watch the trailer.

Advance USA promotes Judeo-Christian religious values. It is based in Independence, Mo., and maintains a Washington, D.C. office.

The Unitarian Universalist Association of Congregations works to connect individual congregations with others across the U.S. Contact the executive assistant for the office of the president, Stephanie Carey Maron.

Neil Clark Warren, a psychologist and former dean at Fuller Theological Seminary, co-founded and chairs the eHarmony online dating service. He has written several books about relationships, including Date … or Soul Mate?: How to Know if Someone Is Worth Pursuing in Two Dates or Less.