He's the subject of the biographies "Official and Confidential" & "The Man and the Secrets"
[DOC] [TLE] Mark Felt - Wikipedia [PAR] William Mark Felt, Sr. (August 17, 1913  December 18, 2008) was a Federal 
Bureau of ..... Adrian Havill questioned these claims in his 1993 biography of 
Woodward and Bernstein, ... on June 23, 1972, that Felt would "want to cooperate 
because he's ambitious.