Dr. Deirdre Lyell is Co-Chair and Co-Principal Investigator at California Perinatal Quality Care Collaborative (CPQCC), Chair and Principal Investigator at California Maternal Quality Care Collaborative (CMQCC), and the Dunlevie Professor of Obstetrics and Gynecology at Stanford Medicine. She brings more than 25 years of clinical experience in maternal-fetal medicine and obstetrics and gynecology. She has conducted impactful, practice-changing research in clinical obstetrics, and on health disparities in obstetrics, anemia, severe maternal morbidity, placenta accreta spectrum and prematurity prevention. She has led quality improvement (QI) initiatives locally and at scale, working with community members, people with lived experience and providers to ensure that everyone receives the same care. At Stanford Medicine, she serves as Director of the Perinatal Epidemiology and Population Health in the Dunlevie Maternal-Fetal Medicine Center; Medical Director of Labor and Delivery; Associate Division Director of Maternal-Fetal Medicine; Medical Director or the Program in Placental Disorders; and project lead for the NIH-funded Center of Excellence, PReventing Inequities in Hemorrhage-related Severe Maternal morbidity (PRIHSM). Nationally, Dr. Lyell is a founding board member of the Pan American Society for Placenta Accreta Spectrum, a board member of the Society for Maternal-Fetal Medicine Foundation, an examiner for the American Board of Obstetrics and Gynecology MFM specialty boards, and has a grant reviewer for the National Institutes of Health.