Dorsey Armstrong is a Professor of English and Medieval Literature at Purdue University, where she is also the head of the Department of English. She received her PhD in Medieval Literature from Duke University. She is the executive editor of the academic journal Arthuriana, which publishes cutting-edge research on the legend of King Arthur, from its medieval origins to its modern enactments. She is a recipient of the Charles B. Murphy Outstanding Undergraduate Teaching Award, Purdue’s top undergraduate teaching honor. Her other Great Courses include The Black Death: The World’s Most Devastating Plague and The Medieval World.

Dr. Bruce E. Fleury (1950–2020) was a Professor of the Practice in the Department of Ecology and Evolutionary Biology at Tulane University. He earned a BA from the University of Rochester in Psychology and General Science and an MA in Library, Media, and Information Studies from the University of South Florida. His career as a college reference librarian led him to Tulane University, where he became head of the university library's Science and Engineering Division. He went on to earn an MS and a PhD in Biology, both from Tulane. Professor Fleury was the author of numerous articles and newspaper columns, both popular and professional, and a reference book on dinosaurs. He taught between 600 and 700 students a year, and his courses included ornithology, introductory general biology and environmental biology, the history of life, and evolution in human health and disease. His teaching awards included two awards for outstanding teaching from the Tulane chapter of the Mortar Board National College Senior Honor Society and a Mortar Board "Last Lecture" Award, in which favorite professors are invited to give a lecture as if it were their last. Professor Fleury served as an advisor for Warner Brothers' space epic Green Lantern, working on several classroom and laboratory scenes and serving as a "consulting xenobiologist" on alien life.