Stephen Mayo, Ph.D. has served as a member of our Board since July 2022. Since 2021, he has served as a member of the board of directors and as a member of the research and development and audit committees of Sarepta Therapeutics, Inc., and as a member of the board of directors and on the audit and research committees of Merck & Co., Inc., each a publicly traded company. In addition, he serves on the scientific advisory board of Vida Ventures. He co-founded Molecular Simulations Inc. (now Biovia), Protabit LLC and Xencor, Inc., a public antibody engineering company. Dr. Mayo is currently the Bren Professor of Biology and Chemistry and Merkin Institute Professor at California Institute of Technology (Caltech). He joined the Caltech faculty in 1992, was a Caltech-based Howard Hughes Medical Institute Investigator from 1994 to 2007, served as Vice Provost for Research from 2007 to 2010 and served as Chair of the Division of Biology and Biological Engineering from 2010 to 2020. Dr. Mayo was elected to the National Academy of Sciences in 2004 for his pioneering contributions in the field of protein design. He served as an elected board member for the American Association for the Advancement of Science from 2010 to 2014 and as a presidential appointee on the National Science Foundation s National Science Board from 2013 to 2018. Dr. Mayo holds a B.S. in Chemistry from Pennsylvania State University and a Ph.D. in Chemistry from Caltech. He completed postdoctoral work at both UC Berkeley and Stanford University School of Medicine in chemistry and biochemistry, respectively. Skills and Qualifications : Our Nominating and Corporate Governance Committee and Board of Directors believe Dr. Mayo's expertise and experience in cancer research, his experience in academia, his experience as a director of other companies and his educational background provide him with the qualifications and skills to serve on our Board of Directors.