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.

The National Marriage Week USA website brings together the many activities that organizations throughout the country, including churches and houses of worship, are doing to strengthen marriage during National Marriage Week USA, Feb. 7-14 each year.

The National Association of Catholic Family Life Ministers works with the U.S. bishops to implement initiatives on behalf of marriage and family life. It also has contact with many other Catholic associations and groups that promote marriage and family life.

The Program for Strong African American Marriages is a five-year intervention study based at the University of Georgia. Prayer is listed as one component of the program, with participants encouraged to pray for their spouses.