Directing Liesl Clark Directed NOVA: Secrets of the Sky Tombs 2017 Himalayan Megaquake 2016 Killer Landslides 2014 Cave People of the Himalaya 2012 Lost Cave Temples of the Himalaya 2009 National Geographic - Everest 50 Years on the Mountain 2003 National Geographic: Surviving Everest 2003 NOVA-Lost Treasures of Tibet 2003 Lost on Everest: The Search for Mallory and Irvine 2000 Lost On Everest 2000 Agent-readable