* Robert Draper is a National Geographic contributing writer who has written extensively about politics, science, and culture. He is the author of several books, including "The President's Man: The Rise of Dinesh D'Souza" and "Do Not Ask What Good We Do: Inside the U.S. House of Representatives."
* Dan Buettner is a National Geographic Fellow and explorer who has written extensively about health and longevity. He is the author of several books, including "The Blue Zones: Lessons for Living Longer From the People Who've Lived the Longest" and "The Longevity Diet: Discover the Best Way to Live to 100."
* Katie Couric is a former CBS Evening News anchor and is currently the global news anchor for Yahoo! News. She has also written several books, including "The Best Advice I Ever Got: Lessons from Extraordinary Lives" and "Going There: My Life in Broadcasting."
* Brian Greene is a theoretical physicist and professor of physics and mathematics at Columbia University. He is the author of several books, including "The Elegant Universe" and "Until the End of Time: Mind, Matter, and Our Search for Meaning in an Evolving Universe."
* J.B. MacKinnon is a Canadian journalist and author who writes frequently for National Geographic. He is the author of several books, including "The Once and Future World: Nature Returns to Human-Altered Landscapes" and "The 100-Mile Diet: A Year of Local Eating."
These are just a few of the many authors who have contributed to National Geographic's website. The site also features articles and contributions from a variety of other experts, including scientists, historians, photographers, and filmmakers.