Gregory Frost is a Research Chemist at NOAA’s Earth System Research Laboratory in Boulder, Colorado, USA. After receiving a PhD in physical chemistry from the University of Colorado (CU) at Boulder in 1995, he started work at NOAA as a National Research Council postdoctoral fellow. From 1997 to 2014, Frost was also a Research Scientist with CU’s Cooperative Institute for Research in Environmental Sciences. Frost’s research uses atmospheric observations and modeling to understand emissions and tropospheric chemistry and their impacts on air quality and climate change. Frost co-chairs the Global Emissions InitiAtive (GEIA), the emissions and chemical processes working group of NASA’s Geostationary Coastal and Air Pollution Events (GEO-CAPE) science team, and the Inverse Modeling of Emissions Assessment. He serves on the science team for the Fire Influence on Regional and Global Environments Experiment (FIREX), the steering committee of the Community Emissions Data System (CEDS), and the advisory board of the Emissions of Atmospheric Compounds and Compilation of Ancillary Data (ECCAD) project. He is an associate editor for the Journal of Geophysical Research – Atmospheres and an editor for the journal Atmospheric Chemistry and Physics.