Anthony Aveni, Russell B. Colgate Professor of Astronomy and Anthropology, is quoted in a Des Moines Register article on Halloween traditions and how they have changed over the years. (http://www.dmregister.com/news/stories/c4788998/22600393.html)
Aveni is the author of ‘The Book of the Year’a Brief History of Our Seasonal Holidays’ (Cambridge University Press ‘ available online and in bookstores).
More on Aveni: http://departments.colgate.edu/physics/faculty/aaveni.htm, http://departments.colgate.edu/nast/faculty/aveni.html