Alvin S. Felzenberg is an American presidential historian and political commentator who was Principal Spokesman for the National Commission on Terrorist Attacks Upon the United States , also known as the 9/11 Commission .
Alvin S. Felzenberg is an American presidential historian , political commentator , and public official . 
 He was Principal Spokesman for the National Commission on Terrorist Attacks Upon the United States , also known as the 9/11 Commission .