Allen C. Guelzo is the Henry R. Luce Professor of the Civil War Era, and Director of Civil War Era Studies at Gettysburg College. He is the author of Abraham Lincoln: Redeemer President (1999), Lincoln’s Emancipation Proclamation: The End of Slavery in America (2004), Lincoln and Douglas: The Debates That Defined America (2008) and Fateful Lightning: A New History of the Civil War and Reconstruction (2012). His book on the battle of Gettysburg, Gettysburg: The Last Invasion was a New York Times best seller in 2013. He has produced six lecture series for The Teaching Company, on topics ranging from Mr. Lincoln to The American Revolution to (most recently) America’s Founding Fathers. He has served as a member of the National Council for the Humanities, and been designated as a Distinguished Lecturer for the Organization of American Historians. His most recent book is Reconstruction: A Concise History (Oxford University Press, 2018) and he is currently at work on a biography of Robert E. Lee. His website is www.allenguelzo.com.