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Frances H. Arnold is the Dick and Barbara Dickinson Professor of Chemical Engineering, Biochemistry and Bioengineering at the California Institute of Technology, where she engineers biological molecules and systems by directed evolution. Dr. Arnold received a B.S. in mechanical and aerospace engineering from Princeton University in 1979 and a Ph.D. in chemical engineering from the University of California at Berkeley in 1985. She is listed as co-inventor on more than 30 U.S. patents and has served as science advisor to more than 10 companies, including Maxygen, Amyris, Codexis, Mascoma, and Gevo Inc.,a company she co-founded in 2005 that develops new microbial routes to producing fuels and chemicals from renewable resources. She has received numerous academic awards, including the 2011 Charles Stark Draper Prize, and is one of the select few who is a member of all three membership organizations of the National Academies—the National Academy of Engineering (2000), the Institute of Medicine in (2004), and the National Academy of Sciences (2008).