Dr. Ravishankara is a Professor in the Departments of Chemistry and Atmospheric Science at Colorado State University. He was at National Oceanic and Atmospheric Administration’s Chemical Sciences Division (CSD) of Earth System Research Laboratory for nearly 30 years in Boulder, CO. There, he served as the Director of CSD from 2006 through 2014, and was a Senior Scientist prior to the Directorship. Before coming to NOAA, he was at Georgia Institute of Technology in Atlanta. Dr. Ravishankara has worked over the past four decades on the chemistry of the Earth's atmosphere as it relates to stratospheric ozone depletion, climate change, and regional air quality. His measurements in the laboratory and in the atmosphere have contributed to deciphering the ozone layer depletion, including the ozone hole; to quantifying the role of chemically active species on climate; and to advancing understanding of the formation, removal, and properties of pollutants. He is an author or coauthor of more than 350 peer-reviewed publications. Dr. Ravishankara is a member of the US National Academy of Sciences, as well as Fellow of the American Geophysical Union, of the Royal Society of Chemistry, of the American Association for the Advancement of Science, and of the International Union of Pure and Applied Chemistry. His many awards include the Polanyi Medal of the Royal Society of Chemistry, the Stratospheric Ozone Protection award of the US Environmental Protection Agency, and the American Chemical Society's award for Creative Advances in Environmental Sciences. He was a co-chair of the WMO/UNEP Science Assessment Panel on Stratospheric Ozone till 2015 and a member of the Science Advisory Panel of the Climate Clean Air Coalition of UNEP. He chairs the US NAS/NRC Board on Atmospheric Science and Climate and the UNEP Vienna Convention Trust Fund Science Advisory Panel. He has served or continues to serve on many other national and international committees. He is on the Editorial Board of the Proceedings of the National Academy of Science and Current Science. He has previously served as an Editor of Geophysical Research Letters, and has been on the Editorial Board of Chemical Physics Research Letters, Chemical Physics Physical Chemistry, ACS Central Science, and International Journal of Chemical Kinetics.