John D. Colombo is a professor at the University of Illinois College of Law in Champaign, Ill. He has proposed a theoretical and practical system for determining when nonprofit entities should receive tax exemptions.

Gina Torielli is director of the graduate tax program at the Thomas M. Cooley Law School in Lansing, Mich. She is an expert on tax-exempt organizations.

Vaughn E. James is a law professor at Texas Tech University. He wrote the article “Reaping Where They Have Not Sowed: Have American Churches Failed to Satisfy the Requirements for the Religious Tax Exemptions?” for the Catholic Law Review (2004).

Natalie Davis is a political science professor at Birmingham-Southern College in Alabama. She is an expert on religion and taxes.

Robert Wineburg is the Jefferson Pilot Excellence Professor of social work at the University of North Carolina-Greensboro who has looked at IRS investigations of churches for political activities related to elections. He is the author of the Faith-Based Inefficiency: The Follies of Bush’s Initiatives, and he has been writing comprehensively about faith-based politics and social services […]

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.