Evan Wolfson is a lawyer and executive director of Freedom to Marry. He argued the Boy Scout case before the Supreme Court, as well as the Hawaii marriage case.

Charles A. Cesaretti is executive director of the Center for Sexuality and Religion, which helps faith communities sexual spiritual health and justice. It is based in Wayne, Pa.

Lou Sheldon is chairman of the Traditional Values Coalition, a conservative group that wants a constitutional amendment that would ban same-sex marriage, ban same-sex unions and ban gays from receiving benefits of any such unions.

Beverly LaHaye is founder and chairman of the Concerned Women for America, a conservative group that opposes same-sex marriage.

Glenn Stanton is the director for Family Formation Studies at Focus on the Family in Colorado Springs.

Maggie Gallagher is president of the Institute for Marriage and Public Policy in Washington. D.C. and a co-author of The Case for Marriage.

Michael Galloway is the chairman of Your Catholic Voice, a conservative Catholic group that supports a constitutional ban on same-sex marriage.

The National Organization for Marriage lists its mission as “to protect marriage and the faith communities that sustain it.”

The Institute for Marriage and Public Policy, based in Manassas, Va., posts research briefs on marriage-related topics. The institute also hosts a Marriage Debate blog.