Thomas E. Hill Jr. is Kenan Professor of Philosophy at the University of North Carolina, Chapel Hill. He has also taught at the University of California at Los Angeles and has held visiting appointments at Stanford University and the University of Minnesota.
He has written widely on ethics and political philosophy. Books published previously include 'Human Welfare and Moral Worth' (2002), 'Respect, Pluralism and Justice: Kantian Perspectives' (2000) and 'Dignity and Practical Reason in Kant's Moral Theory' (1992). Arnulf Zweig currently teaches at
Baruch College, City University of New York. He is Professor Emeritus of Philosophy at the University of Oregon and has held visiting appointments at Harvard and M.I.T.
He is the editor and translator of Kant's correspondence and has published articles in the philosophy of law, ethics and the history of philosophy. Books published previously include 'Kant: Correspondence' (1999) and Kant: Philosophical Correspondence, 1759-1799 (1967, 1970).

Bill Yenne has traveled far and wide to research his topics and to shoot the photographs that have appeared in his books. He has flown in the jump seat of a B-52 and has worked with the legendary U.S. Air Force commander, General Curtis E. LeMay, to produce Superfortress: The B-29 and American Airpower in World War II, which Publisher's Weekly described as "an eloquent tribute." Yenne is the author of more than 75 non-fiction books on a wide variety of topics, from history to popular cultrue to transportation.