Following medical school at Perelman School of Medicine at the University of Pennsylvania, Dr. Geisser completed residency in pediatrics at Seattle Children's Hospital. With a growing interest in cardiology and critical care, she worked at Seattle Children's Hospital as a PICU and CICU hospitalist before pursuing a fellowship in pediatric cardiology at Ann & Robert H. Lurie Children's Hospital of Chicago and a second fellowship in pediatric critical care medicine at Boston Children's Hospital. Her primary research interest is improving outcomes for pediatric cardiac patients supported with extracorporeal membrane oxygenation (ECMO).