W. Bradford Wilcox is director of the National Marriage Project at the University of Virginia. He is co-editor of When Marriage Disappears: The New Middle America and author of articles on domestic abuse in outlets such as The New York Times and The Wall Street Journal.

Sheila Weber is executive director of National Marriage Week USA, which takes place annually leading up to Valentine’s Day.

Elizabeth Marquardt is director of the Center for Marriage and Families at the Institute for American Values. She is co-editor of When Marriage Disappears: The New Middle America (2011) and author of Between Two Worlds: The Inner Lives of Children of Divorce.

David Kinnaman is president of the Barna Group, which conducts research on religious life within the United States and around the world.

William Frey, a senior demographer at the Brookings Institution, analyzed the census data showing that for the first time fewer than half of American households are headed by married couples.

Stephanie Coontz teaches history and family studies at Evergreen State College in Olympia, Wash., and is director of research and public education for the Council on Contemporary Families, which she chaired from 2001-04. She is the author of Marriage, a History: From Obedience to Intimacy, or How Love Conquered Marriage.

Andrew J. Cherlin is a demographer at Johns Hopkins University who has commented on demographic data involving marriage and families.

June Carbone, a law professor at the University of Missouri-Kansas City, is co-author of Red Families v. Blue Families: Legal Polarization and the Creation of Culture (2010). She has commented on demographic data involving marriage and families.

Amy Burdette, a sociologist at Florida State University, has conducted research into whether infidelity, marijuana use and other behaviors are more or less common among churchgoers.