Terry Gross

Baghdad-born activist Yanar Mohammed directs the Organization of Women's Freedom in Iraq.

Col. Lawrence Wilkerson was chief of staff for former Secretary of State Colin Powell; he became an outspoken critic of the Bush administration after leaving the State Department in January 2005.

Lawrence Wright is an author, screenwriter, playwright and a staff writer for The New Yorker magazine. He sits on the Council on Foreign Relations, and he won a Pulitzer Prize for his book The Looming Tower: Al-Qaeda and the Road to 9/11.

Iraqi-born professor Kanan Makiya teaches Islamic and Middle Eastern studies at Brandeis University, outside Boston. He is one of the leading Arab intellectuals who called for the removal of Saddam Hussein; he also advised the Bush administration before the invasion of Iraq.

Lt. Col. John Nagl commands the 1st Battalion, 34th Armor at Fort Riley, Kan. He served in Operation Desert Storm and was the operations officer of a tank battalion task force in Operation Iraqi Freedom. He helped author the Army's Counterinsurgency Field Manual.

Ali Allawi served as minister of trade and minister of defense under the Interim Iraqi Governing Council from 2003 to '04, then was minister of finance in the Iraqi Transitional Government between 2005 and '06.

Gen. Sir Michael Rose was best known as the commander of the U.N. Protection Force in Bosnia in the 1990s. In 2006, he called for the impeachment of then-Prime Minister Tony Blair for leading England into war in Iraq under false pretenses.

A former U.S. ambassador to Croatia and a senior diplomatic fellow at the Center for Arms Control and Non-Proliferation, Peter Galbraith is author of The End of Iraq: How American Incompetence Created A War Without End.

Hamburg-born Astrid Kirchherr met the Beatles in 1960, before they were famous. She took some of the earliest photographs of the group and was engaged to Stuart Sutcliffe, the Beatles' original bassist, before he died of a brain hemorrhage in 1962.

David Kirkpatrick is a correspondent in the Washington bureau for The New York Times. He covered the politics of the conservative Christian movement in the 2004 election, and has been following the presidential campaign of former Arkansas Governor Mike Huckabee.