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).

Michael C. Dorf is a professor at Columbia University Law School. He is an expert on constitutional law.

Jon W. Davidson is Legal Director at Lambda Legal, a national legal organization committed to achieving full recognition of the civil rights of lesbians, gay men, bisexuals, transgender people and those with HIV.

Ken Choe is Deputy General Counsel and Counselor to the Office of Health Reform at the Department of Health and Human Services. Before that, Choe was a Senior Staff Attorney at the LGBT Rights and AIDS Projects of the national ACLU. He also served as a political appointee in the Clinton Administration focusing on health care law and policy.