Jack P. Hallman has been a backpacker for more than forty years and, with Elizabeth D. Hailman, has hiked extensively in Rocky Mountain National Park. The Hailmans are the authors of Backpacking Wisconsin. Hiking Circuits in Rocky Mountain Natrona/ Park is the first guide dedicated entirely to the loop trails of Rocky Mountain National Park, trails that return hikers to their starting point without the necessity of retracing steps or walking on roads.

Having explored the park extensively for more than 30 years, Jack and Elizabeth Hallman describe and map 33 circuits and component loops, with detailed driving instructions to the access points Circuits range from a 15-minute stroll around a lake to strenuous all-day outings in the high country and even a few multi-day packing trips. Side trips are often recommended for viewing a scenic waterfall, summit, lake, or other natural feature. A convenient table lists circuits by walking time, allowing hikers to choose loops designed to fit their schedules.