Jackson J. Spielvogel is Associate Professor Emeritus of History at the Pennsylvania State University, USA. He is the author of Western Civilization (10th edition, 2018). He is the coauthor (with William Duiker) of World History (9th edition, 2017) and The Essential World History (9th edition, 2020).

David Redles received his PhD in History from the Pennsylvania State University and is Professor of History at Cuyahoga Community College in Cleveland, Ohio, USA. He is author of Hitler's Millennial Reich: Apocalyptic Belief and the Search for Salvation (hardcover: 2005, paperback: 2008).