Laura Donaldson is an associate professor of English at Cornell University in Ithaca, N.Y. She has written about women’s beliefs in the New Age movement, which includes belief in many supernatural and paranormal phenomena.

David Roozen, professor of religion and society and director of the Hartford Seminary Institute For Religion Research, has written about religious television. He specializes in national religious trends.

Jason Hawes is founder of the Atlantic Paranormal Society, which investigates paranormal phenomena, including ghosts, in the north Atlantic states. He is also a star and producer of the Syfy show Ghost Hunters. Contact Jason here or via Facebook.

Michael Brown is a professor of anthropology and Latin American studies at Williams College in Williamstown, Mass. He has written about belief in magic and in channeling.

Eugene Gallagher is a professor of religious studies at Connecticut College in New London. He has written about belief in sorcery and new religious movements. He is the co-author of Why Waco.

The American Ghost Society is a national network of ghost hunters, authors, ghost enthusiasts and psychical researchers who conduct investigations into the paranormal. They maintain a list of members and ghost hunters by state.

The National Spiritualist Association of Churches maintains a state-by-state list of Spiritualist churches across the United States.

Robert Todd Carroll is the author of The Skeptics Dictionary: A Collection of Strange Beliefs, Amusing Deceptions, and Dangerous Delusions (John Wiley & Sons, 2003) and maintains a website of the same name. He is a retired philosophy professor at Sacramento City College in California.

Barry Karr is executive director of the Committee for Skeptical Inquiry, which aims to promote scientific inquiry, critical investigation, and the use of reason in examining controversial and extraordinary claims.