David W. Keith is the Gordon McKay Professor of Applied Physics for Harvard University's Paulson School of Engineering and Applied Sciences (SEAS) and professor of public policy for the Harvard Kennedy School at Harvard University. Early contributions include development of the first atom interferometer (considered a major breakthrough in atomic physics) and a Fourier-transform spectrometer used by NASA to measure atmospheric temperature and radiation transfer from space. A specialist on energy technology, climate science, and related public policy, and a pioneer in carbon capture and storage, Keith is a founder and board member of Carbon Engineering.