Matthew White is the creator of the online Historical Atlas of the 20th Century. His data has been cited by forty-five published books and eighty scholarly articles. He lives in Richmond, Virginia. Steven Pinker is a Johnstone Family Professor in the Department of Psychology at Harvard University. He conducts research on language and cognition; writes for publications such as the New York Times, Time, and The Atlantic; and is the author of ten books, including The Language Instinct, How the Mind Works, The Blank Slate, The Stuff of Thought, The Better Angels of Our Nature, and The Sense of Style: The Thinking Person's Guide to Writing in the 21st Century.

"Genius."