Terry Gross

John Prendergast is the co-director of the Africa Program for the International Crisis Group. He's the author of the book God, Oil, and Country; Changing the Logic of War in Sudan. Before joining ICG, he was a special advisor to the U.S. State Department, where he worked on a number of issues, including Sudan policy.

Dr. Rowan Gillies is the International President of Midecins Sans Frontihres (Doctors Without Borders). He is a medical doctor and surgeon from Sydney, Australia. Dr. Gilles began working with Doctors Without Borders in 1998 as a field doctor in Afghanistan. Since then he has worked with the organization in Sierra Leone, South Sudan and Liberia. He recently returned from Sudan.

Dr. Jerry Avorn is a Harvard Medical school researcher and clinician. His new book, Powerful Medicines, uses patient vignettes, scientific critique and statistics to examine the benefits and side effects of prescription drugs.