Paul Johnson is a historian whose work ranges over the millennia and the whole gamut of human activities. He regularly writes book reviews for several UK magazines and newspapers, such as the Literary Review and the Spectator, and he lectures around the world. He lives in London.

James Adams is one of the world's leading authorities on terrorism and intelligence, and for more than twenty-five years he has specialized in national security. He is also the author of fourteen bestselling books on warfare, with a particular emphasis on covert warfare. A former managing editor of the London Sunday Times and CEO of United Press International, he trained as a journalist in England, where he graduated first in the country. Now living in Southern Oregon, he has narrated numerous audiobooks and earned an AudioFile Earphones Award and two coveted Audie Award for best narration.