David Keith has worked near the interface between climate science, energy technology, and public policy for 25 years. Best known for his work on the science, technology, and public policy of solar geoengineering, he led the development of Harvard’s Solar Geoengineering Research Program. He took first prize in Canada's national physics prize exam, won MIT’s prize for excellence in experimental physics, and was one of TIME magazine's “Heroes of the Environment.” Keith is a professor at the Harvard School of Engineering and Applied Sciences and Harvard Kennedy School, and is the founder of Carbon Engineering, a company developing technology to capture CO2 from ambient air.