Jeffrey T. Kiehl, Ph.D. is a senior scientist at NCAR, where he heads the Climate Change Research Section. Over the past 30 years he has carried out research on a wide range of scientific questions regarding anthropogenic climate change. He has published over one hundred articles on topics including the effects of greenhouse gases on Earth’s climate, the effects of stratospheric ozone depletion on climate, and the effects of aerosols on the climate system. He is the co-author of Frontiers of Climate Modeling published by Cambridge University Press. His most recent research has been on Earth’s deep past climates and what they can tell us about future climate change. He is currently developing research into Earth’s hydrological cycle and also the topic of climate change effects on biodiversity. He is also participating in projects to better communicate climate change science to the public.