Dr. Marcus received her medical degree from the Medical College of Virginia/Virginia Commonwealth University and a bachelor of science from the University of North Carolina at Chapel Hill. She received specialty training as a resident in pediatrics at Yale University followed by subspecialty fellowship training in pediatric hematology and oncology at the Johns Hopkins Hospital and the National Institutes of Health National Cancer Institute (NIH-NCI). She received additional training in clinical trials research at the Duke University-NIH Program.

Following completion of her fellowship, Dr. Marcus stayed on at NIH-NCI for a research fellowship where she wrote and conducted successful clinical trials, one of which she published in the New England Journal of Medicine. She then took a faculty position as assistant professor at the George WashingtonUniversity School of Medicine, and as attending physician at the Center for Cancer and Blood Disorders at Children’s National Medical Center before joining the U.S. Food and Drug Administration (FDA) in 2014 as a medical officer.

Dr. Marcus has been an invited speaker at various venues including the FDA, American Association for Clinical Research, Children’s Oncology Group, Therapeutic Advances in Childhood Leukemia and Lymphoma International Conference, and The Emirates Hematology International Conference. She has board certification/subspecialty certification in pediatrics and pediatric hematology/oncology.