Dave is an atmospheric physicist and founder of Crisp Spectra, LLC an environmental science consultancy. Previously his career at NASA’s Jet Propulsion Laboratory focused on development of instruments and numerical models for analyzing light reflected, emitted, and scattered by atmospheres and surfaces of the Earth and other planets. He served as a flight instrument provider and science team member on several Earth, planetary and astrophysics missions. He was the Principal Investigator of the NASA Orbiting Carbon Observatory (OCO) mission and served as the science team leader for NASA’s OCO-2 and OCO-3 missions. He also served as the greenhouse gas lead for the Committee on Earth Observation Satellites (CEOS) Atmospheric Composition - Virtual Constellation (AC-VC) and member of the CEOS/CGMS Working Group on Climate Greenhouse Gas Task Team.