Terry Gross

Director of the Centre for the Study of Terrorism and Political Violence, Bruce Hoffman. He's been studying terrorism for 20 years, and advises governments and businesses around the world about it. He has a new book about the history of terrorism is, "Inside Terrorism" (Columbia University Press).

Journalist Philip Gourevitch is a staff writer for "The New Yorker" and is author of the new book, "We wish to inform you that tomorrow we will be killed with our families: stories from Rwanda" (Farrar Straus and Giroux). It's about the genocide in Rwanda in 1994 and it's aftermath. That spring and summer at least 800,000 people were killed in just one hundred days when the Hutu led government implemented a policy of murder against the minority Tutsis

Former governor of Massachusetts (1991-1997) William Weld. As a Republican, he's been criticized by many of his fellow party members for his un-Republican-like stances. He's pro-gay, pro-choice on abortion, and he endorses condom distribution in public schools. He'll talk with Terry about breaking rank with other Republicans, especially in light of today's partisan politics. Weld is also the author of a novel, "Mackerel by Moonlight" (Simon & Schuster)