John Zogby is president of Zogby International, a polling organization based in Utica, N.Y., that frequently includes questions about religion and adherence in its polls.

Tom Smith is a senior fellow and director of the General Social Survey at the National Opinion Research Center at the University of Chicago. He is at work on a study of religious change, including how people think about God. He served as a consultant to the Religious Landscape study and is an expert on Catholics and Protestants.

June 27, 2013, The Villager article profiling two practitioners of Wicca.

June 19, 2013, KCUR article and radio broadcast about Wicca.

Lawrence Cunningham is a theology professor at the University of Notre Dame. He wrote the entry on angels in the Harper Collins Dictionary of Religion. He can also discuss the Catholic data in the study.

July 13, 2013, Examiner.com article about the rise of paganism in the United Kingdom and the Church of England’s response.

Vinita Hampton Wright is a Chicago-based novelist and religion editor who wrote A Catalogue of Angels: The Heavenly, the Fallen and the Holy Ones Among Us (2006), about angels in the three Abrahamic traditions.

Ross Stolzenberg is a sociology professor at the University of Chicago. He has written about Jewish concepts of the afterlife.

July 15, 2013, The State article about the evolution of the term “pagan.”