Daniel Jacob is the Vasco McCoy Family Professor of Atmospheric Chemistry and Environmental Engineering in the School of Engineering & Applied Science at Harvard University. He received his Ph.D. in Environmental Engineering from Caltech. His research covers a wide range of topics in atmospheric chemistry, from air quality to climate change. He has led the development of the GEOS-Chem global 3-D model of atmospheric composition, has served as Mission Scientist on eight NASA aircraft missions around the world and is a member of several satellite Science Teams. He is the #1 environmental scientist in the world according to research.com (H-index of 176 for 2014-2021 publications). Jacob has trained over 100 Ph.D. students and postdocs over the course of his career.