Richard W. Bulliet is professor of history at Columbia University. A former Guggenheim fellow, he is the editor of The Columbia History of the Twentieth Centuryand author of The Camel and the Wheel. He is also the author of four novels of mystery and intrigue.
Lyman L. Johnson is professor of history at the University of North Carolina, Charlotte. He is also the general editor for UNM Press's Diï¿½logos series.