President Joe Biden’s nomination of former FDA chief Robert Califf to once again lead the agency aims to bring a familiar face back to FDA at a critical juncture as the agency gears up for a post-COVID-19 world that is expected to include greater reliance on digital technologies and a rethinking of longstanding clinical trial policies. Since his previous run as FDA chief, Califf, who is currently head of clinical policy and strategy for Verily and Google Health, has called...