Scott Wallace is a writer whose book, The Unconquered: In Search of the Amazon’s Last Uncontacted Tribes, is about an expedition of anthropologists who attempt to track a secluded tribe in the Amazon. Wallace chronicles the challenges of the team as they study the Arrow People without making contact.

Dan Buettner is an explorer whose record-setting endurance bike expeditions led to an interest in demographics. The result was the bestseller The Blue Zone: Lessons for Living Longer from the People Who’ve Lived the Longest, which examined the regions where people live longer than others.