A founder of the Wilderness Society and granddaddy of American conservation, Aldo Leopold once worked for the U.S. Forest Service in the high, wild Mogollon Mountains of New Mexico. It was here that he dreamed up the idea of legal “wilderness.” In a 1921 article for the Journal of Forestry, Leopold declared that wilderness should be "a continuous stretch of country preserved in its natural state, open to lawful hunting and fishing, big enough to absorb a two weeks’ pack trip, and kept devoid of roads, artificial trails, cottages, or other works of man."