Dr. Stephen Yoo is the Chief Medical Officer of REGENXBIO. Prior to joining REGENXBIO, he was Medical Science Director of Clinical Development at AstraZeneca and Group Director of Clinical Development at MedImmune, AstraZeneca’s global biologics research and development arm. In these roles, he led the late-phase clinical project teams while providing strategic and operational leadership to physicians and scientists. In previous roles at MedImmune, he provided strategic clinical leadership for early-phase programs. Earlier in his career, Dr. Yoo served as Associate Director of Clinical Development at Abbott Laboratories. Dr. Yoo holds an M.D. from the University of California, Los Angeles School of Medicine and a B.A. in Molecular and Cell Biology from the University of California, Berkeley.