Evelyn Lehrer is a professor of economics at the University of Illinois at Chicago who specializes in the economics of religion. She wrote Religion, Economics, and Demography: The Effects of Religion on Education, Work and the Family (Routledge, 2009).

Michael L. Budde is chairman of the political science department at DePaul University in Chicago and a frequent lecturer on religious studies. Budde can discuss the growth of churches that believe in miracles.

The Pluralism Project at Harvard University offers a state-by-state search engine for religious communities.

The Christian Century is a progressive ecumenical Christian magazine based in Chicago.