Half-Earth, One Water, Too Few Open Spaces to Waste: Wimberley Valley Watershed Association presents stories from the watershed. Lori Olson is a leading voice in the effort to preserve and protect the land, water, and natural culture of the Texas Hill Country. As Executive Director of the Texas Land Trust Council, she has advocated for conservation at all levels, from the heart of the Wimberley Valley to the halls of the Capitol in Washington, D.C.