Unopened set of 48 lectures on 24CDs Professor David Christian is Professor of History at San Diego State University. He received his D.Phil from Oxford University. Professor Christian is the author of This Fleeting World: A Short History of Humanity and Maps of Time: An Introduction to Big History, which won the 2005 World History Association Book Prize. He is a member of the Australian Academy of the Humanities and the Royal Holland Society of Sciences and Humanities.