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.

Gregory Hall is president and CEO of Warner Southern College in Lake Wales, Fla.

Joseph A. Pipa, Jr. is president of Greenville Presbyterian Theological Seminary in Taylors, S.C., as well as a professor of historic and systematic theology.

Timothy D. Terrell is an associate professor of economics at Wofford College in South Carolina. He is a senior fellow with the Cornwall Alliance for the Stewardship of Creation.

David Legates is a professor in the geography department at the University of Delaware. His expertise includes hydroclimatology, computational methods and precipitation and climate change. He is a former director of the university’s Center for Climatic Research and a former Delaware state climatologist. Legates is a noted denier of human contribution to climate change.