Stacey DaCosta Byfield currently leads the Genomics Health Economics and Outcomes Research (HEOR) Team focused on conducting observational research studies using administrative claims, EHR/medical record data and other data sources, including laboratory results data. Stacey joined UnitedHealth Group (UHG) in 2009 in the OptumInsight Life Sciences HEOR group where she started as a Senior Researcher focusing on oncology studies. She later served as VP, Research of the Life Sciences HEOR group before moving to OptumLabs were she led the Data Scientist team and most recently the Oncology Focus Area Research Team. Prior to joining UHG, she worked in the Department of Drug Use Policy and Pharmacoeconomics at the University of Texas M.D. Anderson Cancer Center as a Pharmacoeconomics Research Specialist. In this capacity, her main responsibilities included developing research designs to evaluate clinical, economic and humanistic outcomes of pharmaceutical products and services. She holds a PhD in Tumor Biology from Georgetown University and completed a basic science fellowship at the National Cancer Institute where her work focused on identifying targets of pharmaceutical intervention for metastatic breast cancer. Stacey also received her MPH with a concentration in clinical effectiveness from the Harvard T. H. Chan School of Public Health and has completed the Program in Cancer Outcomes Research Training (PCORT) Fellowship, a jointly sponsored program by the Massachusetts General Hospital and the Dana-Farber Harvard Cancer Center in Boston, Massachusetts.