Dr. Nickolay Krotkov is the Associate Deputy Director for Atmospheres in the Earth Sciences Division at NASA’s Goddard Space Flight Center and Deputy Project Scientist for the NASA’s Earth Observing System chemistrymission (Aura). He received his Ph.D. in Oceanography from the P.P. Shirshov Institute of Oceanology, Russian Academy of Sciences in 1990. Dr. Krotkov has over 40 years of experience in radiative transfer, remote sensing observations, retrieval algorithm development, data analysis and research in the field of atmospheric composition. His experience in radiative transfer and retrievals has led to algorithms for operational satellite data production including the remote sensing of atmospheric trace gases such as sulfur dioxide (SO2) and nitrogen dioxide (NO2) with applications for volcanic plume monitoring and air quality.