Although many were involved in the movement to establish a national park in the Rocky Mountains of Colorado, Enos Abijah Mills is undoubtedly the most important. Mills moved to Estes Park in 1884 when he was only 14, and by 1886, he built himself a small cabin at the foot of Longs Peak. Already an avid outdoorsman, an unplanned meeting with naturalist John Muir on a San Francisco beach in 1889 inspired Mills to take up conservation activism, lecturing, and writing. He camped in every state in the Union as well as Mexico, Canada, and Alaska by 1902 and climbed Longs Peak over 250 times during his lifetime, many times as a guide. In 1907, he was hired as an independent lecturer for the U.S. Forest Service (USFS), which managed the Front Range as part of Medicine Bow National Forest. In 1909, the USFS sought to establish a game refuge there but Mills countered with the proposal for "Estes National Park” instead. However, those involved in the mining, grazing, and logging industries generally opposed the idea of a national park that would restrict commercial activity. In 1910, Mills gained the support of J. Horace McFarland, President of the American Civic Association, for the creation of Rocky Mountain National Park. Mary King Sherman also campaigned for the park, advocating outdoor education for better health and an increased sense of civic duty. Over more than five years, Mills wrote several essays promoting the Rocky Mountains of Colorado for national magazines that were compiled and published in the books Wild Life on the Rockies (1909), The Spell of the Rockies (1911), In Beaver World (1913), and Rocky Mountain Wonderland (1915). Mills gathered further support by traveling across the country and giving speeches about the beauty of the Estes Park area.