Frederick Lawrence is a theology professor at Boston College and the author of Punishing Hate: Bias Crimes Under American Law.

Jeff Strank of LetMyPeopleGo organizes popular gatherings for Jewish singles in several cities. The annual Christmas Eve ball in New York City attracts more than 3,000 people. Contact through the website.

Spark Networks in Beverly Hills, Calif., owns online singles services, including JDate for Jewish singles, CatholicMingle.com, ChristianMingle.com and LDSMingle.com. In its 2007 trends reports, Spark Networks said it is seeing a rise in offline events connected to its dating sites and an increased subscriber base of single parents.

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.

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.