David A. Brennen is the dean of University of Kentucky College of Law. He co-wrote the book The Tax Law of Charities and Other Exempt Organizations: Cases, Materials, Questions and Activities (West Group Publishing, 2003).

Frances Hill is a University of Miami law professor and an expert on the political rights of tax-exempt organizations. She has said tax-exempt organizations can be passionate about politics without losing their tax-exempt status.

Peter Frumkin is professor of social policy, faculty director of the Center for High Impact Philanthropy, and director of the nonprofit leadership program at University of Pennsylvania.He is the author of On Being Nonprofit: A Conceptual and Policy Primer (Harvard University Press, 2005).

Rikki Abzug is a professor of management at Anisfield School of Business at Ramapo College in New Jersey.

Richard Pomp is a law professor at the University of Connecticut and a tax expert.

J. Bryan Hehir is the Parker Gilbert Montgomery Professor of the Practice of Religion and Public Life at the Hauser Center for Nonprofit Organizations at Harvard University’s John F. Kennedy School of Government. He is an expert on religion and American society.

William Mumma is president and general counsel of the Becket Fund for Religious Liberty. Organization officials have said preachers should be free to say whatever they want without threatening their churches’ tax-exempt status.

Rabbi Daniel Lapin is a prominent Washington-based rabbi who supported the Houses of Worship Free Speech Restoration Act of 2005.

Bill Aiken is director of public affairs for Soka Gakkai International-USA, an American Buddhist association based in Santa Monica, California, that opposed the “Houses of Worship Free Speech Restoration Act of 2005.”