Douglas Walker, PhD is an Associate Professor in the Rollins School of Public Health at Emory University. Through the application of high-resolution mass spectrometry platforms, Dr. Walker’s research has shown it is possible to provide measures of up to 100,000 chemical signals in a cost-effective manner using a single human blood sample, providing a key advance for nutritional assessment, precision medicine, and exposome research. Current efforts are focused on the development and application of advanced analytical strategies for measuring the occurrence, distribution, and magnitude of micro- and nanoplastic (MNP) exposures to assist in delineating the mechanisms underlying environment-related diseases in humans. The continued refinement of MNP measurements using exposome-level analyses will greatly expand the ability to characterize how widespread these exposures are in human populations and assess how these exposures result in biological, disease initiating, processes.