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.

The American Medical Association promotes the art and science of medicine and the betterment of public health. Contact via the form on their website.

Psychology Today offers a summary page on marriage, including articles and blogs by relationship experts. The page also includes links to pages on related topics, including divorce, homosexuality and relationships.

The United States Conference of Catholic Bishops provides a summary page on marriage and family. The page includes links to official documents from the Vatican and bishops, blessings and prayers for Catholic households and prayer cards for married couples.

United Power for Action and Justice in Chicago is a coalition of people from religious, civic, health and labor organizations. Through Ezra Community Homes, it has built 1,000 affordable homes on the city’s West Side.

Rabbi Elliot Dorff is a professor of philosophy and university rector at American Jewish University in Bel-Air, Calif. He is an expert in Jewish family issues, including adoption. He has studied the Jewish perspective on assisted death, transhumanism and ethics in general.

Joel Zimbelman, a California State University-Chico, religious studies professor, has written on legal decisions and public opinion informing the debate over the removal of life-sustaining treatment, assisted suicide and euthanasia.