Daniel P. Schrag is the Sturgis Hooper Professor of Geology, Professor of Environmental Science and Engineering at Harvard University, as well as Director of the Harvard Center for the Environment. He is one of the developers of the “Snowball Earth” hypothesis which states that the planet underwent numerous extreme glaciations which may have resulted in rises in atmospheric oxygen levels – leading to the rise of multi-cellular life on Earth. He has co-authored over 160 papers on topics ranging from climate change, Earth history, energy technology, and energy policy. He also studies advanced technologies ranging from low-carbon fuel, shale gas, and carbon capture and storage solutions. He previously served on President Obama’s Council of Advisors on Science and Technology and is the recipient of the James B. Macelwane Medal from the American Geophysical Union.