Agree, The “author” is a group...
Quote:
About the Author
The Mountaineers was established in 1906 in Washington, a state with inspiring and abundant mountain peaks. In addition to the community of outdoor enthusiasts it fosters, the organization's mission is to teach outdoor skills. Over the years, hundreds of thousands have learned outdoor safety and skills from The Mountaineers, ranging from climbing to skiing to kayaking, and much more. Some of the world's most elite climbers have been and continue to be members of The Mountaineers.


IIRC, The Mountaineers is the same group that developed the 10 Essentials.