John F. Milligan, Ph.D. , has served as Executive Chairman of our board of directors since August 2020. Dr. Milligan previously served as the President and Chief Executive Officer of Gilead Sciences, Inc. from March 2016 until February 2019, and as its President and Chief Operating Officer from May 2008 until March 2016, served on the board of directors of Gilead Sciences, Inc. from March 2016 until December 2018, and spent a total of 29 years at Gilead in various roles since 1990. Prior to joining Gilead, Dr. Milligan was a postdoctoral research fellow at the University of California San Francisco Medical Center. Dr. Milligan has served on the board of directors of Pacific Biosciences of California, a publicly traded biotechnology company, since July 2013, Kailera Therapeutics, a publicly traded clinical-stage biopharmaceutical company, since October 2024, and TurnCare, Inc., a privately held patient-support technology company, since December 2023. He also served as the Chair of the Board of Trustees of Ohio Wesleyan University from October 2010 to June 2025. Dr. Milligan received his B.A. in Chemistry from Ohio Wesleyan University in 1983 and his Ph.D. from the University of Illinois at Urbana-Champaign in 1988. We believe Dr. Milligan is qualified to serve as a member of our board of directors based on his extensive experience and leadership roles in the biopharmaceutical industry.