William J. Duiker is a former United States Foreign Service officer and is currently East Asian Professor Emeritus of Liberal Arts at Penn State University. His area of expertise is East Asia; while in the Foreign Service he was stationed in Taiwan , South Vietnam, and Washington, D.C. After leaving the State Department in 1965, he received his Ph. Wikipedia*
On the C-SPAN Networks:
William Duiker has one video in the C-SPAN Video Library; the first appearance was a 2000 Booknotes.