Thomas G. Clemens earned his doctoral degree at George Mason University, where he studied under renowned Maryland Campaign historian Dr. Joseph L. Harsh. Tom has published a wide variety of magazine articles and book reviews, has appeared in several documentary programs, and is a licensed tour guide at Antietam National Battlefield. His essay about Joseph K. F. Mansfield, commander of the Twelfth Corps at Antietam, was published in Corps Commanders in Blue. A professor emeritus from Hagerstown Community College, he also helped found and is the current president of Save Historic Antietam Foundation, Inc., a preservation group dedicated to saving historic properties in the Antietam Valley.