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Charles R. Trepte is a leading figure in atmospheric remote sensing, whose work has fundamentally advanced our understanding of aerosol vertical distributions and their global climate impacts. His research centers on the validation and application of satellite lidar measurements, particularly from the CALIPSO mission, to characterize aerosol optical properties and transport. Trepte’s most influential contribution is the landmark 2013 study comparing CALIOP and AERONET aerosol optical depths, which revealed critical systematic biases in satellite retrievals and established a rigorous framework for reconciling ground-based and space-based observations—a paper that has garnered 197 citations and become a standard reference in the field. He further demonstrated the power of ground-based High Spectral Resolution Lidar (HSRL) in a 2017 study that mapped summertime aerosol vertical structure over the southeastern United States, providing unprecedented detail on pollution and biomass burning layers. This work, part of the SEAC⁴RS campaign, has been cited 66 times and remains essential reading for researchers studying aerosol-cloud interactions. Trepte’s meticulous approach to instrument intercomparison and his leadership in field campaigns have made him a trusted voice in aerosol science, bridging the gap between satellite climatology and process-level understanding.