Harold Holzer is vice president for external affairs at the Metropolitan Museum of Art and the author or editor of several books, including Lincoln at Cooper Union. Gabor Boritt, Robert C. Fluhrer Professor of Civil War Studies and director of the Civil War Institute at Gettysburg College, is the author of The Lincoln Enigma and other books. Mark E. Neely Jr., McCabe Greer Professor of History at Pennsylvania State University, is the author of The Last Best Hope of Earth: Abraham Lincoln and the Promise of America and other books.