Sandra Postel is director of the Global Water Policy Project and co-creator of Change the Course, the national water stewardship initiative awarded the 2017 US Water Prize for restoring billions of gallons of water to depleted rivers and wetlands. From 2009-2015, she served as Freshwater Fellow of the National Geographic Society. Postel is author of Pillar of Sand: Can the Irrigation Miracle Last? and Last Oasis: Facing Water Scarcity, the basis for a PBS documentary. Her work has appeared in Science, Natural History, and Best American Science and Nature Writing.