Answer
Linus Pauling Professor Frances Arnold is a renowned scientist at Caltech. She holds the prestigious position of Linus Pauling Professor, a title bestowed upon exceptional individuals who have made significant contributions to science. Arnold's expertise lies in the field of directed evolution, where she uses laboratory techniques to mimic natural selection and create new enzymes with desired properties. Her groundbreaking work has revolutionized various industries, including pharmaceuticals, biofuels, and agriculture.