Andrew Knoll is the Fisher Professor of Natural History at Harvard University. He has been a member of the Harvard faculty since 1982, serving as both Professor of Biology and Professor of Earth and Planetary Sciences. Professor Knoll’s research focuses on the early evolution of life, Earth’s environmental history, and, especially, the interconnections between the two. He has conducted field research on five continents and for two decades served on the science team for NASA’s MER mission to Mars. Professor Knoll’s honors include the International Prize for Biology, the Walcott Medal and the Mary Clark Thompson Medal of the National Academy of Sciences, the Oparin Medal of the International Society for the Study of the Origins of Life, the Moore Medal of the Society for Sedimentary Geology, the Paleontological Society Medal, and the Wollaston Medal of the Geological Society of London. Knoll is a member of the National Academy of Sciences, the American Academy of Arts and Sciences, and the American Philosophical Society, and is a foreign member of the Royal Society of London. His first book, Life on a Young Planet, received the Phi Beta Kappa Book Award in Science.