Author and researcher C. Kirk Hadaway is director of research for the Episcopal Church Center. He has written widely on the subject of church growth and also worked with the United Church of Christ and Southern Baptist denominations.

Mark David Hall is a professor of political science at George Fox University in Newberg, Ore. Publications include The Forgotten Founders on Religion and Public Life (2009); and The Sacred Rights of Conscience: Selected Readings on Religious Liberty and Church-State Relations in the American Founding (2009).

Frank Ravitch is chair of law and religion at Michigan State University and a scholar of constitutional religious freedom protections. He is author of  several books on the Constitution’s religion clauses, including Freedom’s Edge: Religious Freedom, Sexual Freedom, and the Future of America and Masters of Illusion: The Supreme Court and the Religion Clauses.

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.

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.