More commonly known as the first AD, this person’s responsibility is to make sure everything during production is running smoothly and on time. They make sure that everyone is at the appropriate place at the appropriate time. They’re the one’s with the clip board making sure that all the scenes are shot on schedule. If shooting is falling behind schedule, they’re the ones telling the director to hurry up. They’re the one’s that tell everyone when it’s time for lunch or screaming at the top of their lungs “QUIET ON SET!!”. During pre-production, it is usually the AD’s job to break down the script and devise a shooting schedule. The AD must be approved by the director.