Mary-Claire King is a pioneering geneticist and professor at the University of Washington, best known for her discovery of the BRCA1 gene, which is linked to hereditary breast and ovarian cancer. Her groundbreaking work has transformed cancer genetics, enabling genetic testing and targeted treatments that have saved countless lives. Beyond cancer research, she has made significant contributions to human genetics, including studies on inherited deafness, schizophrenia, and the use of DNA to identify missing persons. A strong advocate for ethical genetic research and public health, King continues to influence the field through her research and mentorship.