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Rachel Chang PhD, DABT is a Senior Toxicologist at Gradient since December 2018. Prior to that, Rachel worked as an Associate Toxicologist at the same company. Rachel completed their PhD in Environmental Toxicology at the University of Washington from 2012 to 2017, focusing on neurodevelopmental effects from traffic-related air pollution exposure with a dissertation on autism-related endpoints. Rachel also worked as an Undergraduate RA at the University of Washington from 2007 to 2009, where Rachel investigated the mechanism of altered ALDH2 expression in responses to changing environmental glucose levels in Saccharomyces cerevisiae through various laboratory techniques.