Henry Graff is Professor Emeritus of History at Columbia University. “The Glorious Republic and The Presidents: A Reference History” are among his many books. He is one of Britannica’s advisors on the U.S. presidents and contributed to Britannica’s entry on George Washington.
Graff, Ph.D. taught this country’s first course on the history of the Presidency. He has written “The Free and the Brave: The Story of the American People” (Rand McNally 1968) and “The Presidents: A Reference History” (Scribner 1984). He is currently working on a third edition of The Presidents, to be published in 2002. In addition, Graff has co-authored “The Modern Researcher” (Harcourt, Brace 1957) with Barzun, who served as Columbia’s dean of faculties and provost from 1958 to 1967.
Source -Columbia.edu
http://www.columbia.edu/cu/news/01/11/henryGraff.html