Ruth DeFries is a professor of ecology and sustainable development at Columbia University in New York. She uses images from satellites and field surveys to examine how the world’s demands for food and other resources are changing land use throughout the tropics. Her research quantifies how these land use changes affect climate, biodiversity and other ecosystem services, as well as human development. A particular focus of her work is in the globally-important tiger landscape of central India, with research that underpins management approaches to reconcile needs of both people and wildlife. She has also developed innovative education programs in sustainable development.

DeFries was elected as a member of the U.S. National Academy of Sciences, one of the country’s highest scientific honors, received a MacArthur “genius” award, and is the recipient of many other honors for her scientific research. In addition to over 100 scientific papers, she is committed to communicating the nuances and complexities of sustainable development to popular audiences through her books “The Big Ratchet: How Humanity Thrives in the Face of Natural Crisis” and “What Would Nature Do?: A Guide for Our Uncertain Times”.