• Andrew Skurka
Andrew Skurka was named National Geographic Adventure magazine's Adventurer of the Year in 2007 for hiking the 6,875-mile Great Western Loop in the western U.S. More recently Skurka completed a 4,700-mile, seven-month trip around Alaska via skis, foot and, a packraft. Skurka joins Boyd shortly after completing his Alaska-Yukon Expedition to talk about the adventure.
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• Carl Hoffman
Carl Hoffman explored the edges of Slovenia for his article "Europe's Borderland" in the September 2010 issue of National Geographic Traveler magazine. Hoffman joins Boyd to share some of what he found.
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• Jonathan Irish
National Geographic Expeditions Program Director Jonathan Irish joins Boyd in the studio to talk about the travel programs offered by the Society. Irish tells Boyd about traveling to exotic locations with National Geographic explorers and scientists.
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• Patrick O’Connor
Did curiosity kill the crocodile? National Geographic grantee Patrick O’Connor recently discovered a now extinct, 100-million-year-old crocodile, with characteristics of a cat. O’Connor tells Boyd about how this croc could run and jump.
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• David Braun
Join National Geographic's daily online news editor David Braun as he shares some of this week’s hottest stories. Braun sits down with Boyd to talk about finding shrimp in your drinking water and sharks in the Potomac River.
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• Jason Bittel
National Geographic grantee Jason Bittel shoots to kill. He packs a .357 Magnum and is on the hunt for wild boar in the Great Smoky Mountains National Park. As Bittel tells Boyd, he is working to reduce the pig’s devastating environmental impact on the region.

• John Vaillant
John Vaillant’s new book The Tiger: A True Story of Vengeance and Survival tells the story of a man-eating tiger on the prowl in eastern Russia that is looking for revenge against a poacher. Vaillant shares the chilling story with Boyd.
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• Bob McCabe
Over 50 years ago photographer Bob McCabe went to Antarctica, and the continent has had a special hold on him ever since. McCabe recently published a new book of photos from his 1959 trip and he joins Boyd to talk about what has changed since then.
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• Susan Leal
Water utility expert and author Susan Leal joins Boyd to talk about her new book Running Out Of Water: The Looming Crisis and Solutions to Conserve Our Most Precious Resource.
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• Story-Climb of Mount Kilimanjaro
In his regular Wild Chronicles segment, Boyd shares a story about almost setting a record on a recent climb of Mount Kilimanjaro—the record for slowest ascent!