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.