Theodore Caplow is a professor of sociology at the University of Virginia in Charlotte. He tracks social changes in families.

Jonathan Rauch is an Atlantic Monthly correspondent, a National Journal columnist and the author of Gay Marriage: Why It Is Good for Gays, Good for Straights, and Good for America (Times Books, 2004).

The Rev. Raymond C. O’Brien is a law professor at Catholic University of America in Washington, D.C. He wrote the article “Single Gender Marriage: A Religious Perspective” for the journal Temple Political & Civil Rights Law Review.

David McCarthy is a professor of theology at Mount St. Mary’s College in Emmitsburg, Md. He wrote the article “Homosexuality and the Practice of Marriage” for the journal Modern Theology.

Cynthia S. W. Crysdale is associate professor for the School of Theology and Religious Studies at Sewanee: The University of the South. She wrote “Christian Marriage and Homosexual Monogamy” for the book Our Selves, Our Souls and Bodies: Sexuality and the Household of God (Crowley Press, 1996).

Carol Sanger teaches family law at Columbia University Law School in New York City.

Barbara A. Babb is a family law professor at the University of Baltimore in Maryland. She has spoken on the legal issues involved with same-sex marriages.

Marvin M. Ellison is Willard S. Bass Professor of Christian Ethics at Bangor Theological Seminary in Maine, author of Same-Sex Marriage? A Christian Ethical Analysis and an ordained minister in the Presbyterian Church (USA).

Nancy Cott is a history professor at Harvard and author of Public Vows: A History of Marriage and the Nation (Harvard University Press, 2001).