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.

The J.M. Dawson Institute of Church-State Studies at Baylor University in Waco, Texas, is devoted to research in the broad area of religion, politics and society and committed to the separation of church and state and the advancement of religious liberty around the world.

The International Center for Law and Religion Studies at Brigham Young University in Provo, Utah, promotes religious liberty and studies the relationships between governments and religious institutions. W. Cole Durham Jr. is a law professor and the center’s director.

The Center for the Study of Law and Religion at Emory University in Atlanta focuses on religion and the law worldwide. It is headed by John Witte Jr., a professor of law and ethics and an expert on religious liberty.