Original sentence: In the early 1960s, Tom Coleman's son, Reed, and his friends, Howard Mead and Frank Terbilcox, upon witnessing the encroachment of lot development along the Wisconsin River, enlisted neighboring landowners to the "Shack" to create a living memorial by preserving the Aldo Leopold "Shack" property where Leopold did his writing and research.They further convinced the other landowners to allow the Foundation to do research and restoration to conserve the land as an integral unit.This piece of land is now known as the Leopold Memorial Reserve.Today, the role of Sand County Foundation has expanded from caretaker of the Leopold Memorial Reserve to advising the managers of land in several countries