Andrew H. Knoll is the Fisher Research Professor of Natural History and Earth and Planetary Sciences, Emeritus, at Harvard University. His books include A Brief History of Earth: Four Billion Years in Eight Chapters and Life on a Young Planet: The First Three Billion Years of Evolution on Earth (Pr...

Andrew H. Knoll is the Fisher Research Professor of Natural History and Earth and Planetary Sciences, Emeritus, at Harvard University. His books include A Brief History of Earth: Four Billion Years in Eight Chapters and Life on a Young Planet: The First Three Billion Years of Evolution on Earth (Princeton). Recipient of the International Prize for Biology and the Crafoord Prize in Geosciences, he is a member of the National Academy of Sciences.