Tom Head is an interdisciplinary historian who specializes in the history of religion, ethics, and ideas. He holds a PhD in religion and society from Edith Cowan University and is author or coauthor of twenty-nine nonfiction books on a wide range of topics, including Oneworld’s Civil Liberties: A Beginner’s Guide, the University Press of Mississippi’s Conversations with Carl Sagan, and Que/Pearson’s The Absolute Beginner’s Guide to the Bible, and Adams Media’s World History 101. He served for nine years as About.com’s guide to civil liberties, and currently writes videos on philosophy and pop culture for Wisecrack, LLC, a popular YouTube channel with over 1.5 million subscribers and over 125 million views.