Dr. Mark Elbroch is a recognized expert on wildlife tracking. A Master Tracker certified by CyberTracker Conservation, he is Director of the Puma Program for Panthera, www.panthera.org. Mark's work with mountain lions has been featured on BBC and inNational Geographic, Scientific American, and the New York Times.He has authored and coauthored ten books on wildlife tracking and natural history and has won the National Outdoor Book Award for his field guides, including the first edition of Mammal Tracks & Sign. He is a regular contributor to National Geographic's News Blog and a regular guest on NPR. He lives on the Olympic Peninsula, Washington.

Casey McFarland is a Senior Tracker certified by CyberTracker Conservation and a Senior CyberTracker Evaluator. He works internationally to train and certify biologists, research teams, and the public and runs courses on track and sign identification throughout the world. His is coauthor of Bird Feathers (Stackpole, 2010) and Peterson Field Guide to North American Bird Nests (to be released in 2019). He lives in Cedar Crest, New Mexico.