Edwards was a seasonal park ranger-naturalist in Glacier National Park for nine years beginning in 1947, and returned almost every summer in the years afterward for research. He spent much of his free time exploring the rugged terrain of the park, and pioneered many different routes up a variety of its spectacular mountains. In 1961 he produced A Climber's Guide to Glacier National Park, published by the Sierra Club, which quickly became a classic work, the definitive mountain guide to the park. I The book was revised and reprinted in the 1970s, 1990s, and as recently as 2017. In the foreword to its 1995 edition, Rolf Larson gave him the unofficial title of patron saint of climbing in the park. Ansel Adams personally gave Edwards permission to use his iconic photographs in the book. Edwards was also a founding member of the Glacier Mountaineering Society, a group that publishes an annual climbing journal and continues to be active in organizing hikes and climbs throughout the park.