Dennis Culhane is a professor of social welfare policy at the University of Pennsylvania where he studies homelessness and housing policy.

Xavier de Souza Briggs is an associate professor of sociology and urban planning at the Massachusetts Institute of Technology and a research fellow at the Hauser Center for Nonprofit Organizations at the Kennedy School of Government at Harvard University. He is editor of The Geography of Opportunity: Race and Housing Choice in Metropolitan America.

William C. Apgar is a senior scholar at Harvard University’s Joint Center for Housing Studies and a lecturer in public policy at the Kennedy School of Government at Harvard University. He is a former assistant secretary of housing at HUD. Affordable housing is one of his main areas of interest. He is a founding member of […]

Dean Hamer is a geneticist and director of the Gene Structure and Regulation Unit at the National Cancer Institute in Bethesda, Md. He is the author of The God Gene: How Faith Is Hardwired Into Our Genes. His hypothesis, criticized by some other scientists, is that some people inherit a gene that predisposes them toward faith in […]

Ryan T. Cragun is an associate professor of sociology at the University of Tampa, where he studies secularization, the nonreligious and members of The Church of Jesus Christ of Latter-day Saints.

Shaun Donovan is secretary of the U.S. Department of Housing and Urban Development. HUD, the nation’s housing agency, is charged with increasing homeownership, particularly among minorities, and creating affordable housing.

Jason Torpy is president of the Military Association of Atheists and Freethinkers. A West Point graduate, he served in Germany, Kuwait and Iraq before leaving the service in 2005 to pursue a master’s degree. He lives in New York City.

Roy Speckhardt is executive director of the American Humanist Association, a nonprofit organization in Washington, D.C., that works on behalf of the nontheistic community.

David Silverman is president of American Atheists. He co-hosts the TV show Atheist Viewpoint and is the author of Fighting God: An Atheist Manifesto for a Religious World. Silverman resides in Piscataway, N.J.