When Dr. Dorothy Andersen confronted a slew of confounding infant deaths, she knew the accepted diagnosis couldn’t be right. Her medical detective work led to our current understanding of Cystic Fibrosis, a disease that circuitously impacts the pancreas and lungs. But she is by no means a household name, and the details of her life get scarcer every day. Who was this scientist, and how did she come to quietly make such an important medical contribution?