• Sean Burch
Extreme athlete Sean Burch recently set a new world record by running from one end of Nepal to the other. The 1,100-mile trek took him over 20,000 feet high peaks and lasted 49 days, six hours and eight minutes. Still in Nepal, Burch talks to Boyd about the physical and mental challenges he faced along the way.
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• Chris Johns
Chris Johns, editor in chief of National Geographic magazine, joins Boyd to talk about The Complete National Geographic. Over 100 years of articles, maps and pictures are now available on hard drive or DVD. Johns joins Boyd in the studio to talk about the software and explain how it makes a perfect Christmas gift.
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• Cheryl Knott
National Geographic Emerging Explorer and biological anthropologist Cheryl Knott is working to keep the orangutans deep in the jungles of Borneo from vanishing forever. As Knott tells Boyd, the orangutans are under threat from hunting and loss of habitat. Orangutans spend 99 percent of their time in trees and deforestation in Borneo is having devastating effects on orangutans’ ability to survive.
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• Florian Schulz
It sometimes takes an outsider to help us appreciate what’s right in our own backyard. Photographer Florian Schulz is from Germany, but it’s the wild areas of North America that fascinate him. Schulz is currently documenting migrations across the continent in a project called “Baja to Beaufort.” Shultz joins Boyd to talk about the animals he captures with his camera
Schulz's Website

• David Braun-NG News
Join National Geographic's daily online news editor David Braun as he shares some of the week’s hottest stories. Braun sits down with Boyd to talk about tigers in captivity.
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• Alan Rabinowitz
As a child, Alan Rabinowitz had such a bad stutter that he couldn’t talk to others. He could, however, speak to animals without trouble. He found he had an affinity for the big cats in the Bronx Zoo, and he made them a promise to find them a place in the world. Now, as Rabinowitz tells Boyd, he has found his voice and he is speaking up for endangered big cats around the world.
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• Andy Summers
Andy Summers is well-known as the lead guitarist for the legendary band The Police. But he is also an accomplished photographer. After playing shows with the band, Summers likes to grab his camera and spend the night shooting whatever town his music takes him to. Summers joins Boyd to talk about his work and an upcoming “Music On…Photography” live event at National Geographic headquarters on Dec. 4, 2010.
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• Kim Cobb
National Geographic Waitt grantee Kim Cobb says scientists must learn how to talk about global warming. Cobb tells Boyd that there is no doubt that the earth is getting warmer, but what exactly the consequences will be is unclear.

• David Quammen
Author David Quammen writes about Great Migrations in the cover story for the November National Geographic magazine. But, as Quammen tells Boyd, it’s not just the well-known animals like zebras and wildebeests that make annual journeys. Aphids and rattlesnakes are on the move as well.
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• Story-First Trip to Nepal
In his regular Wild Chronicles segment, Boyd shares a story about his first trip to Nepal.