John Burt is the Paul Proswimmer Professor of American Literature at Brandeis University. He is the author of Lincoln’s Tragic Pragmatism: Lincoln, Douglas, and Moral Conflict and the editor of The Collected Poems of Robert Penn Warren. He is completing a critical edition of Robert Penn Warren’s book-length poem about race and slavery, Brother to Dragons.

McKenzie A. “Ken” Clements has been a professor in the Department of Mathematics at Illinois State University since 2005. Among the thirty-one books he has written or edited are three international handbooks of mathematics education. Over the past three years, Ken and wife, Nerida Ellerton, have jointly authored Rewriting the History of School Mathematics in North America 1607–1861, Abraham Lincoln’s Cyphering Book and Ten Other Extraordinary Cyphering Books, and Thomas Jefferson and his Decimals 1775–1810.

Don H. Doyle, the McCausland Professor of History at the University of South Carolina, is the author or editor of several books, including Nations Divided: America, Italy, and the Southern Question and Secession as an International Phenomenon. His new book, The Cause of All Nations: An International History of the American Civil War, examines the meaning of the war to the larger world.

Nerida F. Ellerton has been a professor in the Department of Mathematics at Illinois State University since 2002. She was the dean of education at the University of Southern Queensland and has written or edited eighteen books and more than 150 articles published in refereed journals or books. She was formerly editor of Mathematics Education Research Journal, and is currently associate editor of the Journal for Research in Mathematics Education.

James Lander is the author of Lincoln and Darwin: Shared Visions of Race, Science, and Religion. He has lived near London for the past thirty years, and is currently working on a book about a V-1 launch site in Normandy during the Second World War.

Stacy Pratt McDermott is the assistant director and an associate editor of the Papers of Abraham Lincoln. She is the author of two books and numerous articles on American legal history, Abraham Lincoln, nineteenth-century America, and the history of baseball. Her most recent work is a biography, Mary Lincoln: Southern Girl, Northern Woman, part of the Routledge Historical Americans Series.

Martin H. Quitt is a professor emeritus of history at the University of Massachusetts Boston. He is the author of Stephen A. Douglas and Antebellum Democracy and is currently writing a comparative biography of Lincoln and Douglas.