News Corp. vet David Hill is in and David Lyle is out at National Geographic Channels U.S. Hill will serve as chairman of the channels group. Nat Geo TV marketing exec Courteney Monroe (pictured) has ...

On “Arctic Ascent With Alex Honnold,” big-wall climbers set out to make history. Their tense conversations give a peek inside the interpersonal dynamics of those who regularly risk death. By Maya ...