Pamela Jordan is an associate professor of family and child nursing at the University of Washington and developer of the Becoming Parents Program. Her research focuses on the transition to parenthood and supporting individuals and couples as they become parents.

Robin Dion is a research psychologist at Mathematica Policy Research, which has offices in Washington, D.C., and Princeton, N.J. She is the principal investigator for a federally funded research project, Strengthening Families with a Child Born Out-of-Wedlock. Contact Mathematica Policy Research.

The National Abortion Federation (NAF) is the professional association of abortion providers in North America.

The American Congress of Obstetricians and Gynecologists, formerly the American College of Obstetricians and Gynecologists, is a professional organization with over 50,000 members.

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.

The Marriage & Religion Research Institute archives data about marriage from a number of sources. It also posts links to scholars around the country.

The National Conference of State Legislatures’ website includes a summary page on marriage.

Judy Waxman is the vice president and director of health and reproductive rights at the National Women’s Law Center, which works to protect women’s reproductive rights. Contact Maria Patrick.

Nancy Northup is the president and CEO of the Center for Reproductive Rights, a global human rights organization that uses constitutional and international law to secure women’s reproductive freedom. Contact senior press officer Kate Bernyk.