Part 107 recognizes exactly one person with authority over a flight: the remote pilot in command. A crew may include a visual observer and, as here, a separate camera operator, but adding people does not divide the authority — it only adds tasks that must be briefed. The camera operator manipulating a gimbal is not manipulating the flight controls, so no certificate is required for that role. What the arrangement does create is a coordination risk: two people are watching different things through different displays, and the person framing a shot is not the person watching for a hazard. The briefing exists to resolve that in advance by fixing who calls an abort and what words trigger it.