Gary is author of the new book Katrina: After the Flood from Simon & Schuster.
Matthieu's latest writing is The Gangs of Karachi for Harper's and Yemen's Hidden War for Rolling Stone.
Kevan just returned from South Africa and will be in-studio tomorrow.
Rael is co-author of the study Why wealthier people think people are wealthier, and why it matters.
Michael will be in-studio with a couple beer choices and the chance to support a local public school by getting day drunk.