J. T. Sawyer
According to the bio on his website: "JT Sawyer is the pen name for Tony Nester. For 27 years, Tony made his living teaching survival courses and guiding trips throughout the Four-Corners Region and Western U.S. He has taught courses for the military special operations community, Department of Homeland Security, US Marshals, NTSB, FAA and other federal agencies throughout the country. Tony has also worked with celebrities like Josh Brolin, Andrew Zimmern, and Emile Hirsch, and he served as a consultant for the film, Into the Wild.
He holds a BA in Anthropology, is a former EMT, and the author of 12 non-fiction books on survival along with 30+ fiction books under his pen name. He lives in Colorado Springs with his family."