Four of the most controversial directors of the Central Intelligence Agency -- Allen Dulles, Richard Helms, William Colby and Willian Casey -- are the subject of a new book by Douglas Waller, who did much of his research at the Library of Congress. Speaker Biography: Douglas Waller is a former correspondent for Newsweek and Time magazines, where he covered the CIA, the Pentagon, the State Department, the White House and Congress. He is the author of the best-sellers "Wild Bill Donovan," "Big Red" and "The Commandos." For transcript and more information, visit www.loc.gov/today/cyberlc/feature_wdesc.php?rec=7246