The showrunner role for Amazon's Citadel has seen some changes during its production. Initially, Josh Appelbaum and André Nemec were set as the showrunners. However, they departed the project during production due to creative differences. Following their departure, David Weil took over as the primary showrunner. The series was developed by the Russo Brothers' AGBO production company, with the Russo Brothers (Anthony and Joe Russo) also serving as executive producers.
Pro tip: In television production, it's not uncommon for showrunner roles to shift, especially on large-scale, high-budget productions like Citadel, as creative visions evolve or production challenges arise.