Frank Lambert is a history professor at Purdue University in West Lafayette, Ind., and author of The Founding Fathers and the Place of Religion in America (Princeton University Press, 2003).

Carl Esbeck is a professor of law at the University of Missouri in Columbia, where he specializes in First Amendment issues, especially the Establishment and Free Exercise clauses.

Jay D. Wexler is a professor of law at Boston University School of Law, where he teaches law and religion.

John H. Mansfield is a professor emeritus at Harvard University Law School who has taught about issues arising under the Establishment and Free Exercise clauses of the First Amendment. Contact Mansfield or his assistant, Marilyn Uzuner.

Ronald A. Lindsay is president and CEO of the Council for Secular Humanism, based in Amherst, N.Y.

Steven Green is associate professor of law at Willamette University in Salem, Ore., and former general counsel to Americans United for Separation of Church and State. He has litigated cases involving school prayer, religious school funding, religious displays and religious discrimination.

The Liberty Counsel is a nonprofit litigation and educational organization based in Orlando. It is dedicated to advancing religious liberty, “the sanctity of human life and the traditional family.” Mathew Staver is its founder and chairman.

The Catholic League for Religious and Civil Rights is a Catholic civil rights advocacy group that responds to religious discrimination issues concerning Catholics and other Americans. It is based in New York but has chapters throughout the United States. Bill Donohue is its president.

The Alliance for the Separation of School and State is a nonprofit working to remove government involvement in public school education. It is based in Clovis, Calif. Alan Schaeffer is its president.