Paul B. Wignall is Professor of Palaeoenvironments at the University of Leeds, and a leading expert on extinctions. In addition to his considerable research output, he has authored a popular science book, The Worst of Times, and has contributed articles to popular science magazines.
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.