Brian Levin is director of the Center for the Study of Hate & Extremism, a nonpartisan research and policy center at California State University, San Bernardino. Levin is also a professor of criminal justice at the university.

Gregory M. Herek is a psychologist at the University of California, Davis. He is a well-known scholar in the areas of prejudice against lesbians and gay men, hate crimes and anti-gay violence, and AIDS-related stigma.

Repent America is a Philadelphia-based evangelistic organization that works against homosexuality, abortion and evolution.

Janet Porter is the president and founder of Faith2Action, a Christian advocacy group that works to influence politics and legislation. The group is based in Dania Beach, Fla.

Advance USA promotes Judeo-Christian religious values. It is based in Independence, Mo., and maintains a Washington, D.C. office.

The International Association of Chiefs of Police is a professional organization of law enforcement personnel that works to confront new challenges in policing and promote member success. Contact Sarah Guy, the manager of legislative and media affairs.

Gene Sager is professor of philosophy at Palomar College in San Marcos, Calif. He wrote a Dec. 7, 2007, essay in Commonweal magazine titled “A Gringo’s Devotion” about his journey from a childhood as an “Anglo Protestant” to his devotion to Our Lady of Guadalupe and eventual conversion to Catholicism.

Jonathan Haidt is a professor of ethical leadership at New York University’s Stern School of Business. His research interests are morality, emotion, religion and politics. He is the author of The Happiness Hypothesis: Finding Modern Truth in Ancient Wisdom and The Righteous Mind: Why Good People Are Divided by Politics and Religion.

Robert C. Roberts is a professor of ethics at Baylor University. He specializes in virtues and emotions and wrote the entry on gratitude in New Dictionary of Christian Ethics & Pastoral Theology.