Brian Caldwell Pohanka was a well-known American Civil War author, historian, and preservationist. He consulted for Academy Award winning, Civil War related films, such as 'Glory' and 'Cold Mountain'. He also made a brief and uncredited appearance as general Alexander S. Webb in the 1993 film of the battle of Gettysburg. Wikipedia*
On the C-SPAN Networks:
Brian Pohanka has one video in the C-SPAN Video Library; the first appearance was a 2002 Call-In.