Rosa Brooks is a Professor of Law at Georgetown University and the author of How Everything Became War and the Military Became Everything. She served in the Defense Department under President Obama, as a counselor to the Undersecretary for Policy.
Joy Reid is the host of MSNBC's weekend morning show "AM Joy" and editor of We Are the Change We Seek: The Speeches of Barack Obama.
Bill McKibben is an environmentalist, author and Professor at Middlebury College. He is the founder of 350.org, the environmental movement working to decrease the amount of carbon dioxide in the atmosphere.