Robert Bartlett is professor emeritus at the University of St Andrews. His books include The Making of Europe, which won the Wolfson Literary Prize for History in 1994, and Why Can the Dead Do Such Great Things? He has written and presented several BBC documentary series, including Inside the Medieval Mind and The Normans.
Jonathan Cowley is a British voice actor who calls Los Angeles home. He has received AudioFile Earphones Awards for his narration of The Science of Evil by Simon Baron-Cohen, The Tower, the Zoo and the Tortoise by Julia Stuart, and The Angry Chef's Guide to Spotting Bullsh*t in the World of Food by Anthony Warner.