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Dr. Laura Lewis is Director of Science at the US Anti-Doping Agency. Previously, she was a Research Fellow at the Australian Catholic University. She was awarded a PCC Research Grant in 2015 and a PCC Fellowship in 2018. We discuss her work on hematological responses to altitude training and iron supplementation, how these impact the Athlete Biological Passport (ABP), her recent work validating a model that addresses blood plasma volume variance in the ABP, and her experiences as a PCC Fellow.