John Lind: The President's Prayer Team

Brzezinski has reported on the nation's homeland security since Sept. 11, for magazines including Mother Jones and The New York Times Magazine. His new book is Fortress America: An Inside Look at the Coming Surveillance State (out later this fall).

Robert Walker, a retired congressman from Pennsylvania who served as chairman of the Science Committee, responds to allegations that the Bush administration has mishandled scientific issues. Walker now serves as chairman of Wexler & Walker, a lobbying firm in Washington, D.C.

Richard Clarke, the former anti-terrorism czar, has now turned his attention to a new national security threat: cyberwar. In a new book, Clarke details what a full-scale cyberattack could look like, how the United States is particularly vulnerable, and what measures can be taken to ensure our networks remain safe.