Richard Kerr
He served in the CIA from 1960 to 1992, including deputy director for intelligence (1986-1989), deputy director (1989-1992), and a few months as acting director in 1991.

John McLaughlin
From 2000 to 2004 he was deputy director of the CIA and became its acting director following George Tenet's resignation in July 2004.

John Brennan
From 1999 to 2005 he worked closely with George Tenet, first as chief of staff, then as deputy executive director, and finally as director of the National Counterterrorism Center.

Gary Berntsen
A 20-year veteran in the clandestine service, he commanded a team of CIA and special forces during the war in Afghanistan in 2001.

Tyler Drumheller
As division chief for the Directorate of Operations (DO) he was the CIA's top spy in Europe until retiring in 2005.

Gary Schroen
Soon after 9/11 he was selected to lead the first trip into northern Afghanistan to connect with leaders of the Northern Alliance, offer money, equipment and political support, and join forces with them to oust the Taliban in Kabul and other cities in northern Afghanistan.

Paul Pillar
A CIA analyst for 30 years, he finished his career as the national intelligence officer for the Near East and South Asia and was involved in the intelligence assessments on the Iraq WMD threat.

Michael Scheuer
He was chief of the CIA's Bin Laden Desk from 1995 to 1999 and headed an internal CIA investigation into alleged intelligence linking Saddam Hussein to Al Qaeda - a connection his team found to be unproven.

Carl W. Ford, Jr.
During the first Gulf War he worked on intelligence in the Pentagon under Secretary of Defense Dick Cheney. From 2001 to 2003 he was in charge of the State Department's Intelligence and Research Bureau.

Lawrence Wilkerson
He was chief of staff to Secretary of State Colin Powell. Since retiring from the State Department, he has been an outspoken critic of the Bush administration.

Lt. Gen. Michael DeLong
From 2000 to 2003 he was deputy commander to Gen. Tommy Franks at Central Command (CENTCOM), where they oversaw U.S. operations in the war in Afghanistan and later the invasion of Iraq.

F. Michael Maloof
Not long after 9/11 he joined the Pentagon's Policy Counterterrorism Evaluation Group that was set up under Undersecretary of Defense for Policy Doug Feith to examine raw intelligence on the terrorist threat and make recommendations.

Sen. Bob Graham
Senator Graham (D-Fla., 1987-2005) chaired the Senate Select Committee on Intelligence. His committee requested a National Intelligence Estimate be done on the threat of Iraq's WMD programs before the Congress voted on whether to go to war.

Richard Clarke
A counterterrorism expert, Richard Clarke was a member of the White House National Security Council in both the Bill Clinton and George W. Bush administrations and is the author of Against all Enemies, an insider account of the Bush administration's policy-making in the war on terror.

Steve Coll
A New Yorker writer, he is the author of Ghost Wars: The Secret History of the CIA, Afghanistan, and Bin Laden, from the Soviet Invasion to September 10, 2001.