Dr James H. Crawford is NASA’s Senior Scientist for Atmospheric Chemistry. In this position, he serves as the agency lead on tropospheric chemistry and air quality. His duties include providing leadership for national and international airborne field studies that collect detailed measurements of atmospheric composition to identify human and natural impacts related to gaseous and particulate pollution. The central aim of Dr Crawford’s work has been to improve the interpretation and application of satellite observations for air quality through integration with surface monitoring, aircraft observations, and air quality models.