Assistant pastor at Riverside Chapel Seventh-day Adventist Church in Nashville, Tenn., which collaborated with several other local Adventist churches on a recent “purity ball.”

An associate professor and program director of public health at Western Kentucky University. He is an expert on teen issues, including sex education.

A professor of anthropology at Radford University in Radford, Va. She wrote God’s Schools: Choice and Compromise in American Society.

Director of the Center on Children, Families and the Law and a psychology professor at the University of Nebraska. He reported on research findings that deal with both abstinence-only and comprehensive sex education.

The Rev. Paul Zahl is a former dean of Trinity Episcopal School for Ministry, a seminary in Ambridge, Pa. He opposes the ordination of sexually active gay clergy. Contact through Eerdmans Publishing Co.

A psychology professor at DePaul University in Chicago. She is an expert on teen pregnancy and adolescent violence. She has conducted a large study on the effectiveness of school-based health clinics.

An associate professor of history at the University of Kansas at Lawrence and author of Teaching Sex: The Shaping of Adolescence in the 20th Century.

Thomas Holman is a professor of marriage, family and human development at Brigham Young University in Provo, Utah. He wrote “The Teaching of Non-marital Sexual Abstinence and Members’ Sexual Attitudes and Behaviors: The Case of Latter-Day Saints” for the Review of Religious Research.

Stanley Carlson-Thies is founder and senior director of the Institutional Religious Freedom Alliance, which has called for a “Fairness for All” approach to religious freedom and LGBTQ rights. He previously worked on faith-based initiatives for the George W. Bush and Barack Obama administrations.