Mr. Duffy has been practicing landscape architecture with the National Park Service for 30 years, working on visitor centers, park roads, campgrounds, trailheads, bicycle paths, mountain trails, maintenance facilities, entrance signs, and waysides across the United States. He is the author of "Guide to Sustainable Mountain Trails – Trail Assessment, Planning & Design Sketchbook, 2007 edition” for the National Park Service.
With extensive experience as a private consultant on mountain trail planning and design, he is the author of many park-wide trail plans for Colorado State Parks. Mr. Duffy has been trained in mountain trail management by the National Park Service and in conservation non-profit volunteer management by the Appalachian Mountain Club. He volunteered extensively with Volunteers for Outdoor Colorado (VOC) in the late 1980s (rising through the ranks to the Board of Directors (1988 – 1990) and more recently was certified as a Master Instructor with the Colorado Outdoor Training Initiative (COTI) now referred to as the Outdoor Stewardship Initiative (OSI). He combines his unique background as a landscape architect, experience with volunteer non-profits and as a private consultant when making recommendations for Sustainable Mountain Trails. He combines sketches with graphics, photos and maps with his written work, best exemplified by the success of his Sketchbook.
Mr. Duffy has conducted two-day field trainings in the Sketchbook process for the Colorado 14ers Initiative, the U.S. Forest Service, and for Rocky Mountain National Park. He contributed to the NPS Rule allowing for bicycle use in National Parks. He is the lead author of internal NPS guidelines, including being the primary author of Sustainability of Backcountry Trails – Minimizing Resource Impacts in 2012."
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